[1] CITMER, IVF Lab, Monterrey, Mexico
[2] CITMER, IVF Lab, Mexico City, DF, Mexico
[3] CITMER, IVF Lab, Puebla, Mexico
[4] CITMER, Reprod Med, Mexico City, DF, Mexico
[5] Natl & Kapodistrian Univ Athens, Sch Med Physiol Embryol, Athens, Greece
[6] Amer Ctr Reprod Med, Androl Ctr, Cleveland, OH USA