- Correspondence to Professor Koji Kawakami, Department of Pharmacoepidemiology, Graduate School of Medicine, Kyoto University, Yoshida Konoecho, Sakyoku, Kyoto 606-8501, Japan;
- Received 5 November 2016
- Revised 30 January 2017
- Accepted 28 February 2017
- Published online 18 March 2017.
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