Velikov Petar, Ichikawa Masao, Hori Ai (University of Tsukuba, Faculty of Medicine, Department of Global Public Health)

Qiao Jiaying, Nishiura Hiroshi (School of Public Health, Kyoto University)

Hanai Eiko, Miyazaki Misako (Chiba University Graduate School of Nursing, Chiba)

Ito Norihiko^1,2,3,4, Oomae Riichi⁵, Narisawa Hiromi⁶, Nakamura Hiroshi⁷, Oonishi Hirofumi⁴ (1.Hokkaido Nemuro public health center, 2.Hokkaido Nakashibetsu public health center, 3.Hokkaido Nemuro subprefecture department of health and environment, 4.Sapporo Medical College, 5.Oomae clinic, 6.Hokkaido Murorun public health center, 7.Nakamura Neurology clinic)