1. Medical Research Unit in Reproductive Medicine, UMAE Hospital de Gineco Obstetricia no. 4 ‘Luis Castelazo‑Ayala’, Instituto Mexicano del Seguro Social, M�xico City 01090, M�xico
2. Departament of Health Science, Universidad Aut�noma Metropolitana, Iztapalapa, M�xico City 09340, M�xico
3. Biological and Health Sciences PhD Program, Universidad Aut�noma Metropolitana, Iztapalapa, M�xico City 09340, M�xico