Division of Clinical Epidemiology, Research Center for Medical Sciences, The Jikei University School of Medicine, Tokyo, Japan. Department of Nephrology, Saku Central Hospital, Nagano, Japan. Section of Clinical Epidemiology, Department of Community Medicine, Graduate School of Medicine, Kyoto University, Kyoto, Japan. Division of Community Health and Primary Care, Center for Medical Education, The Jikei University School of Medicine, Tokyo, Japan. Dialysis Unit, Saku Central Hospital, Nagano, Japan. Department of Nursing, Saku Central Hospital, Nagano, Japan. Department of Pharmacy, Saku Central Hospital, Nagano, Japan. Department of Clinical Engineering, Saku Central Hospital, Nagano, Japan. Division of Rehabilitation Medicine, Saku Central Hospital, Nagano, Japan.