1. Department of Physiology, College of Medicine, Yeungnam University, Daegu 705-717, Korea.
2. Aging-associated Vascular Disease Research Center, College of Medicine, Yeungnam University, Daegu 705-717, Korea.
3. Division of Cardiology, Department of Internal Medicine, College of Medicine, Yeungnam University, Daegu 705-717, Korea.
4. Department of Orthopedic Surgery, Gumi CHA University Hospital, Gumi 730-728, Korea.