Symptom-limited graded treadmill exercise testing in young adults in the CARDIA study. - Sidney,S.; Haskell,W.L.; Crow,R.; Sternfeld,B.; Oberman,A.; Armstrong,M.A.; Cutter,G.R.; Jacobs,D.R.; Savage,P.J.; Van Horn,L. (Med Sci Sports Exerc, 1992)