Presents can come in black boxes, too.
Weiss
Noel S
NS
Department of Epidemiology, University of Washington, Seattle, Washington 98195, USA. nweiss@u.washington.edu
D015981:Epidemiologic Factors; D004812:Epidemiologic Methods; D015340:Epidemiologic Research Design; D016021:Epidemiologic Studies; D004813:Epidemiology; D006801:Humans; D012307:Risk Factors