Funding for this research was provided by:
CONADIC/INPRFM/INSP/ENA 2016/ (001/2016)
Received: 19 July 2017
Accepted: 29 January 2018
First Online: 7 February 2018
Ethics approval and consent to participate
: Study procedures were approved by the Ethics Committees of the following institutions: [Instituto Nacional de Salud Pública (CI: 980); Instituto Mexicano del Seguro Social (IMSS) that includes the Hospital de Oncología del Centro Médico Nacional Siglo XXI and Hospital Regional No.1 “Dr.Carlos MacGregor Sánchez Navarro” (R-2012-785-098); Instituto Nacional de Cancerología (012/040/URI) (CB/776)); Instituto Nacional de Ciencias Médicas y Nutrición Salvador Zubirán (No.599); and finally, Hospital Regional “Adolfo López Mateos” (ISSSTE) authorized the protocol [Authorization No. 098.202.7/002/2012], taking into account the ethic committee approval from the Instituto Nacional de Salud Pública. All study participants signed an informed consent letter after reading it and after clarifying any of their questions.
: Not applicable.
: The authors declare that they have no competing interests
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