1. Gratitude Circle LLC Centreville VA USA
2. Department of International Health Johns Hopkins Bloomberg School of Public Health Baltimore MD USA
3. University of North Carolina School of Medicine Chapel Hill NC USA
4. Division of Maternal Fetal Medicine Duke University Medical Center Durham NC USA
5. Division of Maternal Fetal Medicine University of North Carolina at Chapel Hill Chapel Hill NC USA
6. Department of Obstetrics and Gynecology Medical Faculty Associates George Washington University Washington DC USA