1. Department of Obstetrics and Gynecology, Fetal Medicine Unit, Regional Hospital, Rancagua, Chile;
2. Fetal Surgery Program, FETALMED Maternal-Fetal Diagnostic Center, Santiago, Chile;
3. Department of Neurosurgery, Regional Hospital, Rancagua, Chile;
4. Department of Anesthesiology, Regional Hospital, Rancagua, Chile