Essential epidemiology :
Webb, Penny, 1963-
Essential epidemiology : an introduction for students and health professionals / Penny Webb, Chris Bain, Sandi Pirozzo. - New York, NY : Cambridge University Press, 2005. - p. ; cm.
Essential epidemiology : an introduction for students and health professionals / Penny Webb, Chris Bain, Sandi Pirozzo. - New York, NY : Cambridge University Press, 2005. - p. ; cm.