From the Department of Public Health Medicine, Institute of Community Medicine, University of Tsukuba, Ibaraki-ken (H.I., M.K.); Osaka Medical Center for Health Science and Promotion, Osaka (S.S., A.K., H.I., Y.N., T.O., T.S.); Tokyo Bunka Junior College, Tokyo (U.U.); and Center for Medical Science, Ibaraki Prefectural University of Health Science, Ibaraki-ken (K.K.), Japan. (2002-08時点)
