Daisuke Shimizu1, Takayuki Hoshina1, Masaru Kawamura1,2, Yoshie Tomita3, Yasufumi Hidaka4, Masumi Kojiro5, Jun Muneuchi6, Junji Kamizono3, Kenichiro Yamaguchi2, Yoshihisa Fujino7, Koichi Kusuhara1. 1. Department of Pediatrics, School of Medicine, University of Occupational and Environmental Health, Japan, Kitakyushu, Japan. 2. Department of Pediatrics, National Hospital Organization Kokura Medical Center, Kitakyushu, Japan. 3. Department of Pediatrics, Kitakyushu Municipal Yahata Hospital, Kitakyushu, Japan. 4. Department of Pediatrics, Kitakyushu Municipal Medical Center, Kitakyushu, Japan. 5. Department of Pediatrics, Kitakyushu General Hospital, Kitakyushu, Japan. 6. Department of Pediatrics, Japan Community Health Care Organization Kyushu Hospital, Kitakyushu, Japan. 7. Department of Environmental Epidemiology, School of Medicine, University of Occupational and Environmental Health, Japan, Kitakyushu, Japan.