Heart Disease and Exercise: Part l: Prevention of Disease. Dr. I.Lowensteyn, Dr. S. Grover, Dr. M. Smilovitch Part II: Can Patients Benefit? Dr. M. Smilovitch, Dr. S. Grover, Dr. I.Lowensteyn   AFTER THE BYPASS: KEEPING YOUR PATIENT HEALTHY Dr. Lutchmedial, Dr. Smilovitch    Cardiology Service M.U.H.C. Montreal, Quebec, Canada