- Correspondence to Dr Viet-Thi Tran, METHODS Team, Centre de Recherche Epidémiologie et Statistique Sorbonne Paris Cité (CRESS UMR 1153), INSERM, Paris 06100, France;
- Received July 16, 2018
- Revised March 19, 2019
- Accepted March 30, 2019
- First published April 23, 2019.
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