- Received August 5, 2014, and in revised form October 12, 2014.
- Accepted for publication October 31, 2014.
- Reprints: José Antonio Robles Cervantes, PhD, Unidad de Investigación Médica en Epidemiología Clínica, Unidad Médica de Alta Especialidad, Hospital de Especialidades, Centro Médico Nacional de Occidente, IMSS, Guadalajara, Jalisco, México, Av. Chapalita 1300, Col. Chapalita, CP 45000, Guadalajara, Jalisco, México. E-mail: .
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- First published December 15, 2015.
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