Funding for this research was provided by:
National Institute for Health Research (HPRU in Environmental Change and Health)
Medical Research Council (MR/M022625/1 and MR/R013349/1, MR/M022625/1)
Ministerio de Educación, Cultura y Deporte (PRX17/00705)
Received: 30 June 2018
Accepted: 23 December 2019
First Online: 28 January 2020
Ethics approval and consent to participate
: Not applicable. The only data used was aggregated daily counts of deaths, which authors had permission from the Spanish National Institute of Statistics to analyse.
: Not applicable.
: The authors declare that they have no competing interests.