Doi Ikuko, Nagata Noriko, Tsukagoshi Hiroyuki, Komori Harumi, Motoya Takumi, Watanabe Miki, Keta Toshimasa, Kawakami Manami, Tsukano Takashi, Honda Megumi, Ishioka Taisei, Takeda Makoto, Ryo Akihide, Kuroda Makoto, Oishi Kazunori, Kimura Hirokazu
Ibaraki Prefectural Institute of Public Health.
Jpn J Infect Dis. 2014;67(4):326-8. doi: 10.7883/yoken.67.326.