*Kazue Nakamura1,2, Naomi Matsumoto2, Takashi Yorifuji2, Sayoko Mizobe1, Akiko Murashima1, Sachiko Koumoto1, Hiroaki Matsuoka1
(1. Okayama city public health center, 2. Department of Epidemiology, Graduate School of Medicine, Dentistry and Pharmaceutical Sciences, Okayama University)
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