Ethics approval and consent to participate

The studies discussed in this letter have been performed in accordance with the Declaration of Helsinki. They were approved by the Ethical Committee of the University Hospital of Angers (Comité de Protection des Personnes CPP Ouest II, Angers, France; identification number: CPP CB 2014/02; declaration number: DC-2011-1467; authorization number: AC-2017-2993). All participants provided a written informed consent.

Consent for publication

The participants have provided consent for publication of data.

Competing interests

The authors have no financial and non-financial competing interests to declare.