1. Department of Obstetrics and Gynecology; Division of Fetal-Maternal Medicine; University Hospital Puerta del Mar; Cádiz Spain
2. Department of Obstetrics and Gynecology; University Hospital of Jerez; Cádiz Spain
3. Clínicas Ginemed; Sevilla Spain
4. School of Environmental Sciences and Biochemistry; University of Castilla-La Mancha; Toledo Spain
5. Department of Obstetrics; Division of Fetal-Maternal Medicine; University Hospital La Paz; Madrid Spain