Affiliation: | (1) Department of Nephrology, Graduate School of Comprehensive Human Sciences, Institute of Clinical Medicine, University of Tsukuba, 1-1-1 Ten-oudai, Tsukuba 305-8575, Ibaraki, Japan;(2) Department of Health Care Policy and Management, Graduate School of Comprehensive Human Sciences, University of Tsukuba, Tsukuba, Japan;(3) Department of Epidemiology, Graduate School of Comprehensive Human Sciences, University of Tsukuba, Tsukuba, Japan; |