1 Ariadne Labs, Brigham and Women's Hospital, Harvard T.H. Chan School of Public Health, Boston, MA 02215, USA; Department of Obstetrics and Gynecology, Beth Israel Deaconess Medical Center, Boston, MA, USA; Harvard Medical School, 25 Shattuck St, Boston, MA 02115, USA. Electronic address: [email protected].
2 Ariadne Labs, Brigham and Women's Hospital, Harvard T.H. Chan School of Public Health, Boston, MA 02215, USA.
3 WHO Patient Safety Flagship, Department of Integrated Health Services, WHO, Geneva, Switzerland.
4 Department of Maternal, Newborn, Child and Adolescent Health and Ageing, WHO, Geneva, Switzerland.
5 Jhpiego, New Delhi, India.
6 Ariadne Labs, Brigham and Women's Hospital, Harvard T.H. Chan School of Public Health, Boston, MA 02215, USA; Harvard Medical School, 25 Shattuck St, Boston, MA 02115, USA; Department of Medicine, Brigham and Women's Hospital, Boston, MA USA.