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, MH; Elo, O; Haapa, K; Heinonen, OP; Heinsalmi, P; Helo, P; Huttunen, JK; Kaitaniemi, P; Koskinen, P; Manninen, V; Mäenpää, H; Mälkönen, M; Mänttäri, M; Norola, S; Pasternack, A; Pikkarainen, J; Romo, M; Sjöblom, T; Nikkilä, EA (N Engl J Med, 1987)