[1] Niigata Univ, Grad Sch Med & Dent Sci, Div Clin Nephrol & Rheumatol, 1 757 Asahimachi Dori, Niigata 9518510, Japan
[2] Niigata Univ Hlth & Welf, Fac Hlth Sci, Dept Hlth & Nutr, 1398 Shimami Cho,Kita ku, Niigata 9503198, Japan
[3] Shinkohkai Murakami Kinen Hosp, Dept Nutr, 204 1 Matsuyama, Murakami 9580034, Japan
[4] Niigata Inst Hlth & Sports Med, 67 12 Seigorou,Chuoh ku, Niigata 9500933, Japan