- Correspondence to Dr Sophie Tezenas du Montcel, Département de Santé Publique, Unité de Biostatistiques et Information Médicale, Groupe Hospitalier Pitié - Salpêtrière, Paris 75651, France;
- Received July 28, 2017
- Revised November 11, 2017
- Accepted November 19, 2017
- First published December 26, 2017.
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