1. Risk of upper respiratory tract infection in athletes: an epidemiologic and immunologic perspective;Nieman;J Athl Train,1997
2. Running from colds;Delhagen;Runner's World,1990
3. Current estimates form the National Health Interview Survey, 1990. National Center for Health Statistics;Adams;Vital Health Stat,1991
4. The immunology of exercise, a brief review;Simon;JAMA,1984
5. Medical physiology,1995