1 Division of Nephrology, Department of Internal Medicine, Faculty of Medicine, Saga University, Saga, Japan ; Department of Nephrology, Abe Clinic, Kitakyushu, Japan.
2 Department of Medicine and Clinical Science, Graduate School of Medical Sciences, Kyushu University, Fukuoka, Japan.
3 Department of Internal Medicine, Saiseikai Yahata Hospital, Kitakyushu, Japan.
4 Division of Nephrology, Department of Internal Medicine, Faculty of Medicine, Saga University, Saga, Japan.