1. Nephrology Center, Toranomon Hospital Kajigaya, 1-3-1 Kajigaya, Takatsu, 213-8587, Kawasaki, Kanagawa, Japan
2. Okinaka Memorial Institute for Medical Research, Toranomon Hospital Kajigaya, Kanagawa, Japan
3. Department of Pathology, Toranomon Hospital Kajigaya, Kanagawa, Japan