Division of Nephrology, Tagawa Municipal Hospital, Fukuoka, Japan. Electronic address: ohnaka.kyu@gmail.com. Department of Medicine and Clinical Science, Graduate School of Medical Sciences, Kyushu University, Fukuoka, Japan. Electronic address: ana65641@nifty.com. Department of Medicine and Clinical Science, Graduate School of Medical Sciences, Kyushu University, Fukuoka, Japan. Electronic address: md102059@yahoo.co.jp. Department of Medicine and Clinical Science, Graduate School of Medical Sciences, Kyushu University, Fukuoka, Japan. Electronic address: arasehokuto@gmail.com. Fukuoka Renal Clinic, Fukuoka, Japan. Electronic address: macha1214@gmail.com. Department of Internal Medicine, Fukuoka Dental College, Fukuoka, Japan. Electronic address: tokumoto@college.fdcnet.ac.jp. Department of Nephrology, Nara Medical University, Nara, Japan. Electronic address: tsuruya@naramed-u.ac.jp. Department of Medicine and Clinical Science, Graduate School of Medical Sciences, Kyushu University, Fukuoka, Japan. Electronic address: toshink@med.kyushu-u.ac.jp. Department of Medicine and Clinical Science, Graduate School of Medical Sciences, Kyushu University, Fukuoka, Japan. Electronic address: kitazono@intmed2.med.kyushu-u.ac.jp.