Funding for this research was provided by:
Direction générale de la santé
Santé publique France
Conseil Régional, Île-de-France
Agence Régional de Santé
Received: 18 September 2018
Accepted: 22 March 2019
First Online: 4 April 2019
Ethics approval and consent to participate
: Each adult participant (whether the mother or the father included with his/her child) signed a consent form, after the interviewer made sure it was well understood. The study was approved by the Ethics Review Committee of the National Institute of Health and Medical Research (<i>Institut National de la Santé et de la Recherche Médicale</i>) (Inserm) IRB00003888 under the number 15–247. The declaration to the National Commission of Data Processing and Liberties (<i>Commission Nationale de l’Informatique et des Libertés</i>) (CNIL) of February 262,015 was made under number 1838429v0.
: Not applicable.
: The authors declare that they have no competing interests.
: Springer Nature remains neutral with regard to jurisdictional claims in published maps and institutional affiliations.