Funding for this research was provided by:
Ministerio de Salud, Gobierno de Chile (BID757-58 LP15)
Received: 18 February 2020
Accepted: 31 August 2020
First Online: 14 September 2020
Ethics approval and consent to participate
: The study protocol and ethical consent forms were approved by the ethics committee of the Pontificia Universidad Católica de Chile (PUC) and the Chilean Ministry of Health (ENS 2003: number could not be retrieved; 2010: 09–113; 2017: 16–019). Persons selected for inclusion provided informed and signed consent before participation.
: Not applicable.
: The authors declare that they have no competing interests.