Funding for this research was provided by:
Instituto de Salud Carlos III (PI16-01843)
Instituto de Salud Carlos III (JR15/00042)
Consejería de Salud, Junta de Andalucía (PI-0085-2016)
National Health and Medical Research Council (APP1122952, APP1117510)
Received: 16 January 2019
Accepted: 20 February 2019
First Online: 1 March 2019
Ethics approval and consent to participate
: This study was approved by the Institutional Research Ethic Committee at Hospital Universitario Virgen del Rocío in Sevilla (Spain). Written informed consent was received from participants, prior to inclusion in the study, for genetic studies, for muscle biopsies, and for pictures appearing in the manuscript.
: The authors declare that written informed consents for publication of images relating to individual patients were obtained.
: The authors declare that they have no competing interests.
: Springer Nature remains neutral with regard to jurisdictional claims in published maps and institutional affiliations.