Funding for this research was provided by:
Fondation Daniel & Nina Carasso
French ministry of culture
Rennes 1 University (Défis emergent)
Text and Data Mining valid from 2019-02-20
Received: 3 December 2018
Revised: 6 February 2019
Accepted: 9 February 2019
First Online: 20 February 2019
Compliance with ethical standards
: The authors declare that they have no conflict of interest.
: All procedures performed here were in accordance with our national ethical standards and with the 1964 Helsinki declaration and its later amendments. Our study being only observational no further ethical authorization was requested according to the French law.
: Informed consent was obtained from all individual participants included in the study.