1. From the Department of Geriatric Medicine (Y.T., K.H., T.N., K.Y., N.H., M.A., T.O., R.M.) and Division of Gene Therapy Science (Y.T., K.Y., R.M.), Osaka University, Graduate School of Medicine, Osaka, Japan; and the First Department of Anatomy (K.T.), Fukuoka University, School of Medicine, Hakata, Japan.