Received: 30 July 2019
Accepted: 22 November 2019
First Online: 9 January 2020
Ethics approval and consent to participate
: This study was performed following the Helsinki Declaration regarding the investigation with human subjects.
: Not applicable
: Eduardo Anitua is the Scientific Director of BTI Biotechnology Institute (Vitoria, Spain). He is the head of the Foundation Eduardo Anitua, Vitoria, Spain. Sofia Fernandez-de-Retana and Mohammad H. Alkhraisat are researchers at BTI Biotechnology Institute (Vitoria, Spain).