Funding for this research was provided by:
Fondo Nacional de Desarrollo Científico y Tecnológico (VIBIMOS project No. 11140021: Bio-behavioral surveillance for HIV / AIDS in hard-to-reach populations in the Metropolitan Region of Santiago, Chile.)
Text and Data Mining valid from 2019-04-05
First Online: 5 April 2019
Compliance with Ethical Standards
: Authors declare that they have no conflicts of interest.
: All procedures performed in studies involving human participants were in accordance with the ethical standards of the institutional research committee and with the 1964 Helsinki declaration and its later amendments or comparable ethical standards. The project was approved by the Ethics Committee of the Faculty of Medicine of the University of Chile, approval No. 175-2014.
: Informed consent was obtained from all individual participants included in the study.