1. Division of Kidney Center, Graduate School of Medical Sciences, Kyushu University, Fukuoka, Japan
2. Matsuyama Red Cross Hospital, Matsuyama, Japan; Department of Medicine and Clinical Science, Graduate School of Medical Sciences, Kyushu University, Fukuoka, Japan
3. Graduate School of Medical Sciences, Kyushu University, Fukuoka, Japan; and Department of Integrated Therapy for Chronic Kidney Disease, Graduate School of Medical Sciences, Kyushu University, Fukuoka, Japan