Article History
Received: 23 January 2020
Accepted: 26 May 2020
First Online: 5 June 2020
Change Date: 8 December 2020
Change Type: Update
Change Details: Open Access Funding note was added to backmatter text of the article. This article has been updated to correct this.
Ethics approval and consent to participate
: The study is based on secondary data that is routinely collected and processed by the National Institute of Statistics of Spain (Instituto Nacional de Estadística, INE). All data are published anonymously in its entirety by the INE and are thus publicly and freely available for anyone (see Availability of data and materials, below). The activity related to collecting, analysing and distributing the data produced by the INE is governed by the Spanish Law on the Public Statistical Function of 1989 (Ley de la Función Estadística Pública de 1989), and the European Regulation 223/2009 regarding European statistics. All subjects have given their informed consent for the data to be used for research purposes.
: Not applicable.
: The authors declared that they have no competing interests.