1. aDepartment of Health Policy and Management, Mailman School of Public Health at Columbia University, 600 W 168th Street, New York, NY, 10032, United States of America.
2. bDepartment of Epidemiology Global Health and Population, Harvard School of Public Health, Boston, USA.
3. cJohn Snow, Inc., Monrovia, Liberia.
4. dRepublic of Liberia Ministry of Health and Social Welfare, Monrovia, Liberia.
5. eBasic Support for Institutionalizing Child Survival, Monrovia, Liberia.
6. fInstitute of Population Studies, University of Liberia, Monrovia, Liberia.
7. gDepartment of Epidemiology, Mailman School of Public Health at Columbia University, New York, USA.