BCNatal, Institut d'Investigacions Biomèdiques August Pi I Sunyer, Barcelona, Catalonia, Spain (M.P., A.B.); Clinical Research Branch, Evidence-Based Medicine Department, National Institute of Perinatology, Mexico City, Mexico (R.J.M.-P.); and Barcelona Centre for Maternal-Fetal and Neonatal Medicine, Hospital Clínic Barcelona (E.M., A.B.); and Departament de Cirurgia I Especialitats Medicoquirúgiques, Facultat de Medicina I Ciències de la Salut. Universitat de Barcelona (A.B.), Barcelona, Catalonia, Spain