Funding for this research was provided by:
Instituto de Salud Carlos III (2017/SGR 1342)
Received: 10 March 2019
Accepted: 23 September 2019
First Online: 9 November 2019
Ethics approval and consent to participate
: The study was not submitted for research ethics approval as the activities described were conducted as part of the legislated mandate of the Health Department of Catalonia, the competent authority for the surveillance of communicable diseases, which is officially authorized to receive, treat and temporarily store personal data on cases of infectious diseases according to Decret 203/2015 of 15th September which created the epidemiological surveillance network. Therefore, all study activities formed part of public health surveillance and were thus exempt from institutional board review and did not require informed consent.
: Not applicable.
: The authors declare that they have no competing interests.