1. Department of Physiological Chemistry and Metabolism, Graduate School of Medicine, The University of Tokyo, 7-3-1 Hongo, Bunkyo-ku, Tokyo 1130033, Japan, First Department of Internal Medicine, Faculty of Medicine, Teikyo University, Itabashiku, Tokyo 1730003, Japan, and Department of Rehabilitation, Jikei Medical School, Komae City, Tokyo 2010003, Japan