Article History
First Online: 14 March 2018
Compliance with Ethical Standards
:
: The authors declare that they have no conflict of interest.
: The surveys were approved by local ethical committees including the Ethics Committee of the Chilean Ministry of Health and the Ethics Committee of the Faculty of Medicine, Pontificia Universidad Catolica de Chile. Written informed consent was obtained from all adult interviewees. Individuals with ages between 16 and 18 years provided assent and parents were requested to provide written consent. The Ethics Committees approved all consent procedures. More information can be found in ExternalRef removed.