Funding for this research was provided by:
Consejo Nacional de Innovación, Ciencia y Tecnología de Chile (FONDECYT 1171732)
Received: 25 February 2019
Accepted: 20 August 2019
First Online: 29 August 2019
Ethics approval and consent to participate
: The study was approved by the Research Ethics Committee of Health Services of Concepción (Resolution from 04/03/2018, code CEC 17–09-53) and Talcahuano (Assessment Act 66 from 07/04/2017), Chile. The written informed consent from all participants is to be obtained prior to study commencement. To protect the confidentiality of participants, several measures will be taken. Once data is registered, the identity of every participant will be eliminated from the database.
: Not Applicable.
: The authors declare that the research was conducted in the absence of any commercial or financial relationships that could be construed as a potential conflict of interest.