Helsinki Heart Study: primary-prevention trial with gemfibrozil in middle-aged men with dyslipidemia. Safety of treatment, changes in risk factors, and incidence of coronary heart disease. - Frick,M.H.; Elo,O.; Haapa,K.; Heinonen,O.P.; Heinsalmi,P.; Helo,P.; Huttunen,J.K.; Kaitaniemi,P.; Koskinen,P.; Manninen,V. (N Engl J Med, 1987)