STROBE statement—checklist of items that should be included in reports of observational studies.
DISEASE
(DOCX)Click here for additional data file.We sincerely appreciate the invaluable help and support of the mayor of Ichihara City Hall, Joji Koide. We also sincerely appreciate the support of the president of the Chiba Foundation for Health Promotion and Disease Prevention, Takehiko Fujisawa, and the staff members, Chiori Suzuki, Fumika Kumahara, Fumiya Chiwaki, Hideaki Nagai, Ikumu Matsushita, Kenji Ishii, Makoto Koumi, Michiko Fusaeda, and Saeri Omori. We would like to thank Editage (