1. a Division of Rheumatology, Department of Internal Medicine Seoul National University Hospital, Seoul, South Korea
2. b Division of Rheumatology, Department of Internal Medicine Seoul Metropolitan Government-Seoul National University Boramae Medical Center, Seoul, South Korea
3. c Institute for Stem cell Regenerative Medicine Kangstem Biotech, Seoul, South Korea
4. d Adult Stem Cell Research Center, College of Veterinary Medicine Seoul National University, Seoul, South Korea