1. National Heart, Lung, and Blood Institute National Institutes of Health Bethesda MD 20892 USA
2. National Institute of Arthritis and Musculoskeletal and Skin Diseases National Institutes of Health Bethesda MD 20892 USA
3. Department of Human Kinetics St Francis Xavier University NS B2G 2W5 Antigonish Canada
4. School of Kinesiology Auburn University Auburn AL 36849‐5323 USA
5. Department of Orthopaedic Surgery Washington University School of Medicine Saint Louis MO 63110 USA
6. College of Medicine Department of Medicine University of Arizona Tucson AZ 85724‐5099 USA