作者单位：Department of Obstetrics and Gynecology, Hospital General La Mancha Centro, Avda. de la Constituci[1]Department of Maternal Fetal Medicine, Institute Clinic of Gynecology, Obstetrics and Neonatology[2]Department of Occupational Health, IAPRL, Asturias, Spain[3]Department of Obstetrics and Gynecology, Hospital Universitario Gregorio Mara?ón, Madrid, Spain[4]
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