Reply to Michael Froehner, Rainer Koch, Manfred P. Wirth's Letter to the Editor re: Grace L. Lu-Yao, Peter C. Albertsen, Dirk F. Moore, Yong Lin, Robert S. DiPaola, Siu-Long Yao. Fifteen-year Outcomes Following Conservative Management Among Men Aged 65 Years or Older with Localized Prostate Cancer. Eur Urol 2015;68:805-11