The fascination and challenges of epidemiological research.
Walker
A R
AR
D000328:Adult; D003327:Coronary Disease / Q000453:epidemiology; D004813:Epidemiology / Q000639:trends; D006801:Humans; D008875:Middle Aged; D012106:Research; D013019:South Africa / Q000453:epidemiology; D014481:United States / Q000453:epidemiology