Funding for this research was provided by:
National Council on Science and Technology and Ministry of Education (CONACYT-SEP-SSEDF-2003-CO1-22)
National Council on Science and Technology (CB-2010-01-155221)
National Council on Science and Technology (RG 2015-03-290804)
Received: 6 June 2018
Accepted: 8 October 2018
First Online: 25 October 2018
Ethics approval and consent to participate
: This study was approved by the Research Ethics Committee of the National Institute of Psychiatry (Mexico City, Mexico), and therefore has been performed in accordance with the ethical standards laid down in the 1964 Declaration of Helsinki and its later amendments. All participants gave their written informed consent.
: Not applicable. The submission does not contain any personally identifiable information.
: The authors declare that they have no competing interests.
: Springer Nature remains neutral with regard to jurisdictional claims in published maps and institutional affiliations.