1. Department of Epidemiology, Graduate School of Medicine, Dentistry and Pharmaceutical Sciences, Okayama University, Okayama, Japan.
2. Department of Epidemiology, Harvard T.H. Chan School of Public Health, Boston, MA, USA.
3. Center for Innovative Clinical Medicine, Okayama University Hospital, Okayama, Japan.
4. Department of Social and Behavioral Sciences, Harvard T.H. Chan School of Public Health, Boston, MA, USA.
5. Harvard Center for Population and Development Studies, Cambridge, MA, USA.