Funding for this research was provided by:
Ministerio de Economía y Competitividad (CSO2017-83180-P)
Received: 14 June 2019
Accepted: 2 July 2020
First Online: 13 July 2020
Ethics approval and consent to participate
: The study databases did not include individual identifiers, so approval by the Ethics Committee was not required.
: Not applicable.
: The authors declare that they have no competing interests.