[1] Hospital de la Santa Creu i Sant Pau,Department of Endocrinology and Nutrition
[2] Hospital de la Santa Creu i Sant Pau,Department of Clinical Epidemiology
[3] Case Western Reserve University,Department of Reproductive Biology
[4] MetroHealth Medical Center,CIBER Bioengineering, Biomaterials and Nanotechnology
[5] Instituto de Salud Carlos III,undefined