1 Division of Nephrology and Hypertension, Department of Internal Medicine, St. Marianna University School of Medicine, Kawasaki, Japan.
2 Division of Internal Medicine, Hattori Clinic, Tokyo, Japan.
3 Division of Nephrology and Hypertension, Department of Internal Medicine, St. Marianna University School of Medicine, Kawasaki, Japan. masahikoyazawa@gmail.com.