Funding for this research was provided by:
Fundación Ramón Areces (CIVP18A3903)
Instituto de Salud Carlos III (CD18/00195)
Fundación Isabel Gemio (-)
Received: 9 December 2019
Accepted: 30 October 2020
First Online: 27 November 2020
Ethics approval and consent to participate
: The study was approved by the Ethics Committee at Hospital de la Santa Creu i Sant Pau (HSCSP) in Barcelona. All patients and controls gave informed consent to use their muscle biopsy for research purposes.
: Not applicable.
: The authors declare that they have no competing interests.