1. Department of Cardiology, Cardiovascular Centre, Korea University Anam Hospital Korea University College of Medicine Seoul Korea
2. Department of Internal Medicine Yonsei University College of Medicine Seoul Korea
3. Division of Cardiology, Gangnam Severance Hospital Yonsei University College of Medicine Seoul Korea
4. Rehabilitation Institute of Neuromuscular Disease Yonsei University College of Medicine Seoul Korea
5. Department of Rehabilitation Medicine and Pulmonary Rehabilitation Center, Gangnam Severance Hospital Yonsei University College of Medicine Seoul Korea