Đang chuẩn bị liên kết để tải về tài liệu:
Longterm follow-up in European respiratory health studies – patterns and implications

Selection bias is a systematic error in epidemiologic studies that may seriously distort true measures of associations between exposure and disease. Observational studies are highly susceptible to selection bias, and researchers should therefore always examine to what extent selection bias may be present in their material and what characterizes the bias in their material. |