Received: 17 September 2019
Accepted: 1 June 2020
First Online: 9 June 2020
Ethics approval and consent to participate
: According to the Helsinki Declaration, the protocol was approved by the National Research Ethics Committee, which belongs to the Mexican Institute of Social Security. This committee is the body in charge of evaluating research projects at the national level. The registry number R-2014-785-024.
: Not applicable.
: The authors declare that they have no competing interests.