1. Department of Internal Medicine, Dongguk University College of Medicine, Gyeongju, Korea.
2. Department of Rehabilitation Medicine, Kosin University College of Medicine, Pusan, Korea.
3. Department of Rehabilitation Medicine, Dankook University College of Medicine, Cheonan, Korea.
4. Department of General Thorasic and Cardiovascular Surgery, Dongguk University College of Medicine, Gyeongju, Korea.