1 Clinical Research Division, National Institute of Perinatology "Isidro Espinosa de los Reyes", Mexico City, Mexico.
2 Iberoamerican Research Network in Obstetrics, Gynecology and Translational Medicine, Mexico City, Mexico.
3 Fetal Medicine Research Center, BCNatal, Barcelona Center for Maternal-Fetal and Neonatal Medicine, Hospital Clínic and Hospital Sant Joan de Deu, Institut Clínic de Ginecologia, Obstetricia i Neonatologia, Universitat de Barcelona, Barcelona, Catalonia, Spain.
4 Obstetrics and Gynecology Department, Hospital Universitario de Torrejón, Torrejón de Ardoz, Madrid, Spain.
5 School of Health Sciences, Universidad Francisco de Vitoria (UFV), Pozuelo de Alarcón, Madrid, Spain.
6 Department of Obstetrics and Gynaecology, Prince of Wales Hospital, The Chinese University of Hong Kong, Hong Kong SAR.