- Correspondence to Dr Viet-Thi Tran, Centre de Recherche Epidemiologie et Statistiques Sorbonne Paris Cité (CRESS UMR 1153), Paris 75004, France;
- Received November 2, 2017
- Revised April 9, 2018
- Accepted April 15, 2018
- First published April 29, 2018.
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