Funding for this research was provided by:
European Regional Development Funds (RE0001897)
Received: 26 February 2019
Accepted: 30 May 2019
First Online: 13 June 2019
Ethics approval and consent to participate
: This study was approved by our local ethics committee (Comité de Protection des Personnes de l’Université Paris VII no SC 13-026), which waived the need for written informed consent because of the observational nature of the study.
: Not applicable.
: The authors declare that they have no competing interests.