1. Department of Public Health Sciences, Global Health–Health Systems and Policy Research, Karolinska Institutet, Widerströmska huset, Tomtebodavägen 18A, 17177, Stockholm, Sweden.
2. Department of Women’s and Children’s Health, International Maternal and Child Health (IMCH), Uppsala University, Uppsala, Sweden.
3. Department of Disease Control, London School of Hygiene & Tropical Medicine, London, England.
4. Ifakara Health Institute, Dar es Salaam, United Republic of Tanzania.