1. Department of Internal MedicineSeoul St. Mary's Hospital, College of Medicine Seoul South Korea
2. Uijeongbu St. Mary's Hospital Seoul South Korea
3. Bucheon St. Mary's Hospital Seoul South Korea
4. St. Vincent's Hospital Seoul South Korea
5. Incheon St. Mary's Hospital Seoul South Korea
6. St. Paul's Hospital Seoul South Korea
7. Daejeon St. Mary's Hospital Seoul South Korea