Received: 16 November 2019
Accepted: 17 December 2019
First Online: 23 December 2019
Ethics approval and consent to participate
: Comité Ético de Investigación Clínica (Ethical Committee of Clinical Research), Hospital Universitario La Paz, IdiPAZ, Madrid, Spain. Reference number CEIm: PI-3894
: Not applicable
: The authors declare that they have no competing interest.