1. Seoul SOK Clinic, Seoul, Korea
2. Hiqhong IM Clinic, Incheon, Korea
3. Incheon SOK Clinic, Incheon, Korea
4. Jangbaro Clinic, Uijeongbu, Korea
5. Sundu United Medical Clinic, Icheon, Korea
6. Samsungtop Internal Medicine, Bucheon, Korea
7. Department of Internal Medicine, Seoul Bon Clinic, Seoul, Korea
8. Dr. Kim Young Kwan’s office, Seoul, Korea
9. Yonsei Choisun Internal Medicine Clinic, Incheon, Korea
10. Hunhunhan Internal Medicine Clinic, Seoul, Korea
11. Lim’s Internal Medicine Clinic, Gapyeong, Korea
12. Seoul Medical Clinic, Seoul, Korea