1. Exercise and Cardiovascular Physiology Laboratory, Department of Sport Science, University of Seoul, Seoul, Korea.
2. Section of Cardiology, Department of Internal Medicine, Max Rady College of Medicine, Rady Faculty of Health Sciences, University of Manitoba, Saint Boniface Hospital, Winnipeg, Canada.
3. Institute of Public Health and Clinical Nutrition, University of Eastern Finland, Kuopio, Finland.
4. Institute of Clinical Medicine, Department of Medicine, University of Eastern Finland, Kuopio, Finland.
5. Central Finland Health Care District Hospital District, Department of Medicine, Jyväskylä, Finland.