- Correspondence to Dr Koji Kawakami, Department of Pharmacoepidemiology, Graduate School of Medicine and Public Health, Kyoto University Yoshida Konoecho, Kyoto 606-8501, Japan;
- Received January 11, 2020
- Revision received April 7, 2020
- Accepted April 20, 2020
- First published May 15, 2020.
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