1. Department of PediatricsUniversity of Colorado DenverAuroraColoradoUSA
2. Division of Cardiology (Pediatrics)Caja Nacional de Salud and Clínica del SurLa PazBolivia
3. Department of Respiratory MedicineCardiology, and PhysiologyInstituto Boliviano de Biología de AlturaLa PazBolivia
4. Department of Obstetrics and Gynecology and Center for Women's Health ResearchUniversity of Colorado DenverAuroraColoradoUSA