1. Department of Community and Behavioral Health, College of Public Health, University of Iowa, 145 N. Riverside Drive, Iowa City, IA 52242, USA
2. Formerly Save the Children, Health Department, 1 St. John's Lane, London EC1M 4AR, UK
3. Formerly Save the Children, Department of Global Health, 899 North Capitol St NE #900, Washington, DC 20002, USA