1. Department of Obstetric and Gynecology, University of California, San Francisco, San Francisco, CA, USA
2. Reproductive Medicine and IVF Unit, Department of Obstetrical and Gynecological Sciences, University of Torino, Torino, Italy
3. Department of Experimental Biology, Systems Biology Unit, University of Jaen, Jaen, Spain
4. Fundacion IVI and iGenomix, Araid at I + CS, Hospital Miguel Servet, Zaragoza, Spain