1 Department of Obstetrics and Gynaecology, Prince of Wales Hospital, The Chinese University of Hong Kong, Shatin, Hong Kong, SAR, China.
2 Clinical Research Division, National Institute of Perinatology 'Isidro Espinosa de lo Reyes', Mexico City, Mexico.
3 Iberoamerican Research Network in Obstetrics, Gynecology and Translational Medicine, Mexico City, Mexico.
4 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.