1 Department of Epidemiology and Prevention, Center for Clinical Sciences, National Center for Global Health and Medicine, Tokyo, Japan.
2 Department of Laboratory Testing, Center Hospital of the National Center for the Global Health and Medicine, Tokyo, Japan.
3 Department of Epidemiology and Prevention, Center for Clinical Sciences, National Center for Global Health and Medicine, Tokyo, Japan. mizoue@hosp.ncgm.go.jp.
4 Disease Control and Prevention Center, National Center for Global Health and Medicine, Tokyo, Japan.