- Correspondence to Dr Toshiharu Ninomiya, Department of Epidemiology and Public Health, Graduate School of Medical Sciences, Kyushu University, 3-1-1 Maidashi, Higashi-ku, Fukuoka 812-8582, Japan;
- Received November 1, 2019
- Revised March 6, 2020
- Accepted March 23, 2020
- First published March 31, 2020.
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