1. Department of Nephrology and Rheumatology, Kyorin University School of Medicine, Tokyo, Japan
2. Center for Clinical Epidemiology, St. Luke’s International University, Tokyo, Japan
3. Department of Medicine, University of Hawaii, Honolulu, Hawaii, USA
4. Department of Emergency and General Medicine, Kyorin University School of Medicine, Tokyo, Japan
5. Department of Dermatology, Kyorin University School of Medicine, Tokyo, Japan