1. Center for Research and Innovation in Maternal-Fetal Medicine (CIMAF), Department of Obstetrics and Gynecology, Hospital Sótero del Río, Santiago, Chile;
2. Division of Obstetrics y Gynecology, School of Medicine, Pontificia Universidad Católica de Chile, Santiago, Chile;
3. Clinical Laboratory, Hospital Sótero del Río, Santiago, Chile;
4. Centro de Investigaciones Clínicas, Fundación Valle del Lili, Cali, Colombia;
5. Obstetrical Intensive Care Unit, Maternal-Infant Department, Fundación Valle del Lili, Cali, Colombia