文摘
PURPOSE: To determine whether interviewed non-Hodgkin's lymphoma (NHL) patients differed from non-interviewed NHL patients and to revise the population-based risk estimate for NHL associated with HIV infection in homosexual men in the San Francisco Bay Area. Differences between study participants and non-participants are a concern in epidemiologic studies. Recruitment techniques can be modified when nonparticipation is a result of subject refusal. However, the solutions for nonparticipation due to death are less clear, especially when rapid case ascertainment (RCA) is used to identify newly diagnosed patients.