Habas, Christophe
Article History
Received: 2 January 2018
Accepted: 8 February 2018
First Online: 14 February 2018
Ethical approval and consent to participate
: All volunteers gave their informed consent in 2009.The study in 2009 was approved by the Stanford Institutional Review Board Consent for publication: not applicable.
: Not applicable
: Springer Nature remains neutral with regard to jurisdictional claims in published maps and institutional affiliations.