The epidemiology of silent brain infarction: a systematic review of population-based cohorts
详细信息    查看全文
  • 作者:Jonathon P Fanning (1) (2)
    Andrew A Wong (1) (3)
    John F Fraser (1) (2)

    1. School of Medicine
    ; The University of Queensland ; Brisbane ; Queensland ; Australia
    2. Critical Care Research Group (CCRG)
    ; The Prince Charles Hospital ; Brisbane ; Queensland ; Australia
    3. Department of Neurology
    ; The Royal Brisbane and Women鈥檚 Hospital ; Brisbane ; Queensland ; Australia
  • 关键词:Silent brain infarcts ; Cerebral infarction ; Risk factors ; Epidemiology
  • 刊名:BMC Medicine
  • 出版年:2014
  • 出版时间:December 2014
  • 年:2014
  • 卷:12
  • 期:1
  • 全文大小:410 KB
  • 参考文献:1. Fisher, CM (1965) Lacunes: small, deep cerebral infarcts. Neurology 15: pp. 774-784 CrossRef
    2. Avdibegovic, E, Becirovic, E, Salimbasic, Z, Hasanovic, M, Sinanovic, O (2007) Cerebral cortical atrophy and silent brain infarcts in psychiatric patients. Psychiatr Danub 19: pp. 49-55
    3. Price, TR, Manolio, TA, Kronnal, RA, Kittner, SJ, Yue, NC, Robbins, J, Anton-Culver, H, O'Leary, DH (1997) Silent brain infarction on magnetic resonance imaging and neurological abnormalities in community-dwelling older adults. The Cardiovascular Health Study. CHS Collaborative Research Group. Stroke 28: pp. 1158-1164 CrossRef
    4. Liebetrau, M, Steen, B, Hamann, GF, Skoog, I (2004) Silent and symptomatic infarcts on cranial computerized tomography in relation to dementia and mortality: a population-based study in 85-year-old subjects. Stroke 35: pp. 1816-1820 928.47478.44" target="_blank" title="It opens in new window">CrossRef
    5. Song, IU, Kim, JS, Kim, YI, Eah, KY, Lee, KS (2007) Clinical significance of silent cerebral infarctions in patients with Alzheimer disease. Cogn Behav Neurol 20: pp. 93-98 97/WNN.0b013e31805d859e" target="_blank" title="It opens in new window">CrossRef
    6. Wright, CB, Festa, JR, Paik, MC, Schmeidigen, A, Brown, TR, Yoshita, M, DeCarli, C, Sacco, R, Stern, Y (2008) White matter hyperintensities and subclinical infarction: associations with psychomotor speed and cognitive flexibility. Stroke 39: pp. 800-805 CrossRef
    7. Fujikawa, T, Yamawaki, S, Touhouda, Y (1995) Silent cerebral infarctions in patients with late-onset mania. Stroke 26: pp. 946-949 946" target="_blank" title="It opens in new window">CrossRef
    8. Hamada, T, Murata, T, Omori, M, Takahashi, T, Kosaka, H, Wada, Y, Yoshida, H (2003) Abnormal nocturnal blood pressure fall in senile-onset depression with subcortical silent cerebral infarction. Neuropsychobiology 47: pp. 187-191 9/000071213" target="_blank" title="It opens in new window">CrossRef
    9. Yamashita, H, Fujikawa, T, Yanai, I, Morinobu, S, Yamawaki, S (2002) Cognitive dysfunction in recovered depressive patients with silent cerebral infarction. Neuropsychobiology 45: pp. 12-18 9/000048667" target="_blank" title="It opens in new window">CrossRef
    10. Bokura, H, Kobayashi, S, Yamaguchi, S, Iijima, K, Nagai, A, Toyoda, G, Oguro, H, Takahashi, K (2006) Silent brain infarction and subcortical white matter lesions increase the risk of stroke and mortality: a prospective cohort study. J Stroke Cerebrovasc Dis 15: pp. 57-63 CrossRef
    11. Kobayashi, S, Okada, K, Koide, H, Bokura, H, Yamaguchi, S (1997) Subcortical silent brain infarction as a risk factor for clinical stroke. Stroke 28: pp. 1932-1939 932" target="_blank" title="It opens in new window">CrossRef
    12. Putaala, J, Haapaniemi, E, Kurkinen, M, Salonen, O, Kaste, M, Tatlisumak, T (2011) Silent brain infarcts, leukoaraiosis, and long-term prognosis in young ischemic stroke patients. Neurology 76: pp. 1742-1749 CrossRef
    13. Vermeer, SE, Hollander, M, Dijk, EJ, Hofman, A, Koudstaal, PJ, Breteler, MM (2003) Silent brain infarcts and white matter lesions increase stroke risk in the general population: the Rotterdam Scan Study. Stroke 34: pp. 1126-1129 CrossRef
    14. Longstreth, WT, Dulberg, C, Manolio, TA, Lewis, MR, Baeuchamp, NJ, O'Leary, D, Carr, J, Furberg, CD (2002) Incidence, manifestations, and predictors of brain infarcts defined by serial cranial magnetic resonance imaging in the elderly: the Cardiovascular Health Study. Stroke 33: pp. 2376-2382 9" target="_blank" title="It opens in new window">CrossRef
    15. Asumi, M, Yamaguchi, T, Saito, K, Kodama, S, Miyazawa, H, Matsui, H, Suzuki, E, Fukuda, H, Sone, H (2010) Are serum cholesterol levels associated with silent brain infarcts? The Seiryo Clinic Study. Atherosclerosis 210: pp. 674-677 therosclerosis.2010.01.008" target="_blank" title="It opens in new window">CrossRef
    16. Bokura, H, Nagai, A, Oguro, H, Kobayashi, S, Yamaguchi, S (2010) The association of metabolic syndrome with executive dysfunction independent of subclinical ischemic brain lesions in Japanese adults. Dement Geriatr Cog Disord 30: pp. 479-485 9/000322057" target="_blank" title="It opens in new window">CrossRef
    17. Kwon, HM, Kim, BJ, Lee, SH, Choi, SH, Oh, BH, Yoon, BW (2006) Metabolic syndrome as an independent risk factor of silent brain infarction in healthy people. Stroke 37: pp. 466-470 99081.17935.81" target="_blank" title="It opens in new window">CrossRef
    18. Kwon, HM, Kim, BJ, Park, JH, Ryu, WS, Kim, CK, Lee, SH, Ko, SB, Nam, H, Lee, SH, Lee, YS, Yoon, BW (2009) Significant association of metabolic syndrome with silent brain infarction in elderly people. J Neurol 256: pp. 1825-1831 9-5201-8" target="_blank" title="It opens in new window">CrossRef
    19. Lee, SC, Park, SJ, Ki, HK, Gwon, HC, Chung, CS, Byun, HS, Shin, KJ, Shin, MH, Lee, WR (2000) Prevalence and risk factors of silent cerebral infarction in apparently normal adults. Hypertension 36: pp. 73-77 CrossRef
    20. Matsumoto, M, Inoue, K, Moriki, A (2007) Associations of brachial-ankle pulse wave velocity and carotid atherosclerotic lesions with silent cerebral lesions. Hypertension Res 30: pp. 767-773 91/hypres.30.767" target="_blank" title="It opens in new window">CrossRef
    21. Nakagawa, T, Sekizawa, K, Nakajoh, K, Tanji, H, Arai, H, Sasaki, H (2000) Silent cerebral infarction: a potential risk for pneumonia in the elderly. J Intern Med 247: pp. 255-259 96.2000.00599.x" target="_blank" title="It opens in new window">CrossRef
    22. Saji, N, Kimura, K, Shimizu, H, Kita, Y (2012) Silent brain infarct is independently associated with arterial stiffness indicated by cardio-ankle vascular index (CAVI). Hypertension Res 35: pp. 756-760 CrossRef
    23. Saji, N, Kimura, K, Shimizu, H, Kita, Y (2012) Association between silent brain infarct and arterial stiffness indicated by brachial-ankle pulse wave velocity. Intern Med 51: pp. 1003-1008 9/internalmedicine.51.6852" target="_blank" title="It opens in new window">CrossRef
    24. Uehara, T, Tabuchi, M, Mori, R (1999) Risk factors for silent cerebral infarcts in subcortical white matter and basal ganglia. Stroke 30: pp. 378-382 CrossRef
    25. Yi, CC, Zhang, YQ, Liu, WW, Guo, ZJ, Yin, RF (2011) Prevalence and risk factors of silent cerebral infarction in a Chinese population. Acad J Sec Military Med Univ 32: pp. 537-540 CrossRef
    26. Yoshida, M, Higashi, K, Kobayashi, E, Saeki, N, Wakui, K, Kusaka, T, Takizawa, H, Kashiwado, K, Suzuki, N, Fukuda, K, Nakamura, T, Watanabe, S, Tada, K, Machi, Y, Mizoi, M, Toida, T, Kanzaki, T, Tomitori, H, Kashiwagi, K, Igarashi, K (2010) Correlation between images of silent brain infarction, carotid atherosclerosis and white matter hyperintensity, and plasma levels of acrolein, IL-6 and CRP. Atherosclerosis 211: pp. 475-479 therosclerosis.2010.03.031" target="_blank" title="It opens in new window">CrossRef
    27. Cho, ER, Kim, H, Seo, HS, Suh, S, Lee, SK, Shin, C (2013) Obstructive sleep apnea as a risk factor for silent cerebral infarction. J Sleep Res 22: pp. 452-458 CrossRef
    28. Park, K, Yasuda, N, Toyonaga, S, Tsubosaki, E, Nakabayashi, H, Shimizu, K (2008) Significant associations of metabolic syndrome and its components with silent lacunar infarction in middle aged subjects. J Neurol Neurosurg Psychiatry 79: pp. 719-721 9" target="_blank" title="It opens in new window">CrossRef
    29. Chou, CC, Lien, LM, Chen, WH, Wu, MS, Lin, SM, Chiu, HC, Chiou, HY, Bai, CH (2011) Adults with late stage 3 chronic kidney disease are at high risk for prevalent silent brain infarction: a population-based study. Stroke 42: pp. 2120-2125 97930" target="_blank" title="It opens in new window">CrossRef
    30. Kohara, K, Fujisawa, M, Ando, F, Tabara, Y, Nino, N, Miki, T, Shimokata, H (2003) MTHFR gene polymorphism as a risk factor for silent brain infarcts and white matter lesions in the Japanese general population: the NILS-LSA Study. Stroke 34: pp. 1130-1135 9163.02611.B0" target="_blank" title="It opens in new window">CrossRef
    31. Das, RR, Seshadri, S, Beiser, AS, Kelly-Hayes, M, Au, R, Himali, JJ, Kase, CS, Benjamin, EJ, Polak, JF, O'Donnell, CJ, Yoshita, M, D'Agostino, RB, DeCarli, C, Wolf, PA (2008) Prevalence and correlates of silent cerebral infarcts in the Framingham offspring study. Stroke 39: pp. 2929-2935 CrossRef
    32. DeCarli, C, Massaro, J, Harvey, D, Hald, J, Tullberg, M, Au, R, Beiser, A, D'Agostino, R, Wolf, PA (2005) Measures of brain morphology and infarction in the framingham heart study: establishing what is normal. Neurobiol Aging 26: pp. 491-510 CrossRef
    33. Howard, G, Wagenknecht, LE, Cai, J, Cooper, L, Kraut, MA, Toole, JF (1998) Cigarette smoking and other risk factors for silent cerebral infarction in the general population. Stroke 29: pp. 913-917 9.5.913" target="_blank" title="It opens in new window">CrossRef
    34. Schmidt, R, Schmidt, H, Pichler, M, Enzinger, C, Pertovic, K, Niederkorn, K, Horner, S, Ropele, S, Watzinger, N, Schumacher, M, Berghold, A, Kostner, GM, Fazekas, F (2006) C-reactive protein, carotid atherosclerosis, and cerebral small-vessel disease: results of the Austrian Stroke Prevention Study. Stroke 37: pp. 2910-2916 9" target="_blank" title="It opens in new window">CrossRef
    35. Aono, Y, Ohkubo, T, Kikuya, M, Hara, A, Kondo, T, Obara, T, Metoki, H, Inoue, R, Asayama, K, Shintani, Y, Hashimoto, J, Totsune, K, Hoshi, H, Satoh, H, Izumi, S, Imai, Y (2007) Plasma fibrinogen, ambulatory blood pressure, and silent cerebrovascular lesions: the Ohasama study. Arterioscler Thromb Vasc Biol 27: pp. 963-968 947.17570.38" target="_blank" title="It opens in new window">CrossRef
    36. Willey, JZ, Moon, YP, Paik, MC, Yoshita, M, DeCarli, C, Sacco, RL, Elkind, MS, Wright, CB (2011) Lower prevalence of silent brain infarcts in the physically active: the Northern Manhattan Study. Neurology 76: pp. 2112-2118 CrossRef
    37. Schmidt, WP, Roesler, A, Kretzschmar, K, Ladwig, KH, Junker, R, Berger, K (2004) Functional and cognitive consequences of silent stroke discovered using brain magnetic resonance imaging in an elderly population. J Am Geriatr Soc 52: pp. 1045-1050 CrossRef
    38. Vermeer, SE, Koudstaal, PJ, Oudkerk, M, Hofman, A, Breteler, MM (2002) Prevalence and risk factors of silent brain infarcts in the population-based Rotterdam Scan Study. Stroke 33: pp. 21-25 9" target="_blank" title="It opens in new window">CrossRef
    39. Fukuda, K, Takashima, Y, Hashimoto, M, Uchino, A, Yuzuriha, T, Yao, H (2014) Early menopause and the risk of silent brain infarction in community-dwelling elderly subjects: the Sefuri Brain MRI Study. J Stroke Cerebrovasc Dis 23: pp. 817-822 CrossRef
    40. Satizabal, C, Zhu, Y, Mazoyer, B, Dufouil, C, Tzourio, C (2012) Circulating IL-6 and CRP are associated with MRI findings in the elderly: The 3C-Dijon Study. Neurology 78: pp. 720-727 CrossRef
    41. Choi, P, Ren, M, Phan, T, Callisaya, M, Ly, J, Beare, R, Chong, W, Srikanth, V (2012) Silent infarcts and cerebral microbleeds modify the associations of white matter lesions with gait and postural stability: population based study. Stroke 43: pp. 1505-1510 CrossRef
    42. Russo, C, Jin, Z, Liu, R, Iwata, S, Tugcu, A, Yoshita, M, Homma, S, Elkind, MS, Rundek, T, Decarli, C, Wright, CB, Sacco, RL, Tullio, MR (2013) LA volumes and reservoir function are associated with subclinical cerebrovascular disease: the CABL (Cardiovascular Abnormalities and Brain Lesions) study. JACC Cardiovasc Imaging 6: pp. 313-323 9" target="_blank" title="It opens in new window">CrossRef
    43. Cheung, N, Mosley, T, Islam, A, Kawasaki, R, Sharrett, AR, Klein, R, Coker, LH, Knopman, DS, Shibata, DK, Catellier, D, Wong, TY (2010) Retinal microvascular abnormalities and subclinical magnetic resonance imaging brain infarct: a prospective study. Brain 133: pp. 1987-1993 93/brain/awq127" target="_blank" title="It opens in new window">CrossRef
    44. Vermeer, SE, Heijer, T, Koudstaal, PJ, Oudkerk, M, Hofman, A, Breteler, MM (2003) Incidence and risk factors of silent brain infarcts in the population-based Rotterdam Scan Study. Stroke 34: pp. 392-396 98405.15" target="_blank" title="It opens in new window">CrossRef
    45. Longstreth, WT, Bernick, C, Manolio, TA, Bryan, N, Jungreis, CA, Price, TR (1998) Lacunar infarcts defined by magnetic resonance imaging of 3660 elderly people: the Cardiovascular Health Study. Arch Neurol 55: pp. 1217-1225 9.1217" target="_blank" title="It opens in new window">CrossRef
    46. Morrison, AC, Fornage, M, Liao, D, Boerwinkle, E (2000) Parental history of stroke predicts subclinical but not clinical stroke: the Atherosclerosis Risk in Communities Study. Stroke 31: pp. 2098-2102 9.2098" target="_blank" title="It opens in new window">CrossRef
    47. Pathak, EB, Sloan, MA (2009) Recent racial/ethnic disparities in stroke hospitalizations and outcomes for young adults in Florida, 2001鈥?006. Neuroepidemiology 32: pp. 302-311 9/000208795" target="_blank" title="It opens in new window">CrossRef
    48. Takashima, Y, Miwa, Y, Mori, T, Hashimoto, M, Uchino, A, Yuzuriha, T, Sasaguri, T, Yao, H (2010) Sex differences in the risk profile and male predominance in silent brain infarction in community-dwelling elderly subjects: the Sefuri brain MRI study. Hypertens Res 33: pp. 748-752 9" target="_blank" title="It opens in new window">CrossRef
    49. Moore, RD, Pearson, TA (1986) Moderate alcohol consumption and coronary artery disease: a review. Medicine 65: pp. 242-267 97/00005792-198607000-00004" target="_blank" title="It opens in new window">CrossRef
    50. Mukamal, KJ, Longstreth, WT, Mittleman, MA, Crum, RM, Siscovick, DS (2001) Alcohol consumption and subclinical findings on magnetic resonance imaging of the brain in older adults: the Cardiovascular Health Study. Stroke 32: pp. 1939-1946 901.095723" target="_blank" title="It opens in new window">CrossRef
    51. Fukuda, K, Yuzuriha, T, Kinukawa, N, Murakawa, R, Takashima, Y, Uchino, A, Ibayashi, S, Iida, M, Yao, H, Hirano, M (2009) Alcohol intake and quantitative MRI findings among community dwelling Japanese subjects. J Neurol Sci 278: pp. 30-34 CrossRef
    52. Bokura, H, Yamaguchi, S, Iijima, K, Nagai, A, Oguro, H (2008) Metabolic syndrome is associated with silent ischemic brain lesions. Stroke 39: pp. 1607-1609 CrossRef
    53. Pezzini, A, Zotto, E, Padovani, A (2007) Homocysteine and cerebral ischemia: pathogenic and therapeutical implications. Curr Med Chem 14: pp. 249-263 92986707779941140" target="_blank" title="It opens in new window">CrossRef
    54. Wu, XQ, Ding, J, Ge, AY, Liu, FF, Wang, X, Fan, W (2013) Acute phase homocysteine related to severity and outcome of atherothrombotic stroke. Eur J Intern Med 24: pp. 362-367 CrossRef
    55. Vermeer, SE, Dijk, EJ, Koudstaal, PJ, Oudkerk, M, Hofman, A, Clarke, R, Breteler, MM (2002) Homocysteine, silent brain infarcts, and white matter lesions: the Rotterdam Scan Study. Ann Neurol 51: pp. 285-289 CrossRef
    56. Seshadri, S, Wolf, PA, Beiser, AS, Selhub, J, Au, R, Jacques, PF, Yoshita, M, Rosenberg, IH, D'Agostino, RB, DeCarli, C (2008) Association of plasma total homocysteine levels with subclinical brain injury: cerebral volumes, white matter hyperintensity, and silent brain infarcts at volumetric magnetic resonance imaging in the Framingham Offspring Study. Arch Neurol 65: pp. 642-649 CrossRef
    57. Manolio, T, Burke, G, O鈥橪eary, D, Evans, G, Beauchamp, N, Knepper, L, Ward, B (1999) Relationships of cerebral MRI findings to ultrasonographic carotid atherosclerosis in older adults: the cardiovascular health study. Atheroscler Thromb Vasc Biol 19: pp. 356-365 9.2.356" target="_blank" title="It opens in new window">CrossRef
    58. Seliger, SL, Longstreth, WT, Katz, R, Manolio, TA, Fried, LF, Shlipak, M, Stehman-Breen, CO, Newman, A, Sarnak, M, Gillen, DL, Bleyer, A, Siscovick, DS (2005) Cystatin C and subclinical brain infarction. J Am Soc Nephrol 16: pp. 3721-3727 CrossRef
    59. Heo, SH, Lee, SH (2010) High levels of serum uric acid are associated with silent brain infarction. J Neurol Sci 297: pp. 6-10 CrossRef
    60. Knuiman, MW, Folsom, AR, Chambless, LE, Liao, D, Wu, KK (2001) Association of hemostatic variables with MRI-detected cerebral abnormalities: the atherosclerosis risk in communities study. Neuroepidemiology 20: pp. 96-104 9/000054767" target="_blank" title="It opens in new window">CrossRef
    61. Zhu, YC, Dufouil, C, Tzourio, C, Chabriat, H (2011) Silent brain infarcts: a review of MRI diagnostic criteria. Stroke 42: pp. 1140-1145 CrossRef
    62. Koch, S, McClendon, MS, Bhatia, R (2011) Imaging evolution of acute lacunar infarction: Leukoariosis or lacune?. Neurology 77: pp. 1091-1095 CrossRef
    63. Potter, GM, Marlborough, FJ, Wardlaw, JM (2011) Wide variation in definition, detection, and description of lacunar lesions on imaging. Stroke 42: pp. 359-366 94754" target="_blank" title="It opens in new window">CrossRef
    64. Bokura, H, Kobayashi, S, Yamaguchi, S (1998) Distinguishing silent lacunar infarction from enlarged Virchow-Robin spaces: a magnetic resonance imaging and pathological study. J Neurol 245: pp. 116-122 9" target="_blank" title="It opens in new window">CrossRef
    65. Reitz, C, Schupf, N, Luchsinger, JA, Brickman, AM, Manly, JJ, Andrews, H, Tang, MX, DeCarli, C, Brown, TR, Mayeux, R (2009) Validity of self-reported stroke in elderly African Americans, Caribbean Hispanics, and Whites. Arch Neurol 66: pp. 834-840 9.83" target="_blank" title="It opens in new window">CrossRef
    66. Howard, VJ, McClure, LA, Meschia, JF, Pulley, L, Orr, SC, Friday, GH (2006) High prevalence of stroke symptoms among persons without a diagnosis of stroke or transient ischemic attack in a general population: the REasons for Geographic And Racial Differences in Stroke (REGARDS) study. Arch Intern Med 166: pp. 1952-1958 952" target="_blank" title="It opens in new window">CrossRef
    67. Sterne, JA, Egger, M, Smith, GD (2001) Investigating and dealing with publication and other biases in meta-analysis. BMJ 323: pp. 101-105 CrossRef
    68. Rockwood, K, Gubitz, G (2008) Silent cerebral infarction: are we listening?. Stroke 39: pp. 2919-2920 CrossRef
    69. Fanning, JP, Walters, DL, Platts, DG, Eeles, E, Bellapart, J, Fraser, JF (2014) Characterization of neurological injury in transcatheter aortic valve implantation: how clear is the picture?. Circulation 129: pp. 504-515 CrossRef
    70. Fanning, JP, Wesley, AJ, Platts, DG, Walters, DL, Eeles, EM, Seco, M, Tronstad, O, Strugnell, W, Barnett, AG, Clarke, AJ, Bellapart, J, Vallely, MP, Tesar, PJ, Fraser, JF (2014) The silent and apparent neurological injury in transcatheter aortic valve implantation study (SANITY): concept, design and rationale. BMC Cardiovasc Disord 14: pp. 45 CrossRef
  • 刊物主题:Medicine/Public Health, general; Biomedicine general;
  • 出版者:BioMed Central
  • ISSN:1741-7015
文摘
Background Cerebral infarction is a commonly observed radiological finding in the absence of corresponding, clinical symptomatology, the so-called silent brain infarction (SBI). SBIs are a relatively new consideration as improved imaging has facilitated recognition of their occurrence. However, the true incidence, prevalence and risk factors associated with SBI remain controversial. Methods Systematic searches of the Medline and EMBASE databases from 1946 to December 2013 were performed to identify original studies of population-based adult cohorts derived from community surveys and routine health screening that reported the incidence and prevalence of magnetic resonance imaging (MRI)-determined SBI. Results The prevalence of SBI ranges from 5% to 62% with most studies reported in the 10% to 20% range. Longitudinal studies suggest an annual incidence of between 2% and 4%. A strong association was seen to exist between epidemiological estimates of SBI and age of the population assessed. Hypertension, carotid stenosis, chronic kidney disease and metabolic syndrome all showed a strong association with SBI. Heart failure, coronary artery disease, hyperhomocysteinemia and obstructive sleep apnea are also likely of significance. However, any association between SBI and gender, ethnicity, tobacco or alcohol consumption, obesity, dyslipidemia, atrial fibrillation and diabetes mellitus remains unclear. Conclusions SBI is a remarkably common phenomenon and endemic among older people. This systematic review supports the association of a number of traditional vascular risk factors, but also highlights disparities between clinically apparent and silent strokes, potentially suggesting important differences in pathophysiology and warranting further investigation.
NGLC 2004-2010.National Geological Library of China All Rights Reserved.
Add:29 Xueyuan Rd,Haidian District,Beijing,PRC. Mail Add: 8324 mailbox 100083
For exchange or info please contact us via email.