AMERICAN COLLEGE OF SPORTS MEDICINE; AMERICAN HEART ASSN; CENTERS FOR DISEASE CONTROL + PREVENTION; COOPER INST FOR AEROBICS RESEARCH; HARTFORD HOSPITAL; HARVARD; LAWRENCE BERKELEY NATL LAB; LONDON SCHOOL OF HYGIENE + TROPICAL MEDI; MULTI RISK FACTORS INTERVENTION TRIAL; NIH, NATL INST OF HEALTH; RUNNERS WORLD MAGAZINE; STANFORD; UNIV OF MN; UNIV OF SC