Department of Physiology;
Faculty of Medicine and Nursery;
University of the Basque Country (UPV/EHU);
Leioa;
Biscay 48940;
Spain;
In Vitro Fertilization Laboratory;
IVI Bilbao;
Landabarri Promenade 1;
Leioa;
Biscay 48940;
Spain;
IVI Foundation;
IVI Valencia;
Local Police Square 3;
Valencia 46015;
Spain;