Smucker R, Block G, Coyle L, Harvin A, Kessler L. A dietary and risk factor questionnaire and analysis system for personal computers. Am J Epidemiol. 1989 Feb;129(2):445-9.
Smucker R, Block G, Coyle L, Harvin A, Kessler L. A dietary and risk factor questionnaire and analysis system for personal computers. Am J Epidemiol. 1989 Feb;129(2):445-9.