Yasuko Fuse-Nagase1, Takuya Kuroda2, Junko Watanabe3. 1. University Health Center, Ibaraki University, 2-1-1 Bunkyo, Mito, Ibaraki, 310-8512, Japan. Electronic address: yasuko.fuse.uhc@vc.ibaraki.ac.jp. 2. University Health Center, Ibaraki University, 2-1-1 Bunkyo, Mito, Ibaraki, 310-8512, Japan; Department of Student Affairs Division of Student Welfare, University of Tsukuba, 1-1-1 Tennodai, Tsukuba, Ibaraki, 305-8577, Japan. Electronic address: tkuroda.1134@gmail.com. 3. University Health Center, Ibaraki University, 2-1-1 Bunkyo, Mito, Ibaraki, 310-8512, Japan. Electronic address: junko.watanabe.uhc@vc.ibaraki.ac.jp.