Measuring psychosocial variables in epidemiologic studies of cardiovascular disease : proceedings of a workshop / National Heart, Lung, and Blood Institute in conjunction with the University of Texas Medical Branch, Galveston, Texas, December 11-14, 1983 ; editors, Adrian M. Ostfeld, Elaine D. Eaker, associate editors, Richard B. Shekelle ... [et at.], managing editor, Tom J. Truss, Jr