1 Department of Disease Control, London School of Hygiene & Tropical Medicine, London, UK; Department of Public Health Science (Global Health), Karolinska Institutet, 171 77 Stockholm, Sweden. Electronic address: claudia.hanson@ki.se.
2 Department of Disease Control, London School of Hygiene & Tropical Medicine, London, UK.
3 Ifakara Health Institute, Dar-es-Salaam, Tanzania.
4 Institute of Public Health, Ruprecht-Karls-University, Heidelberg, Germany.
5 Department of Epidemiology and Public Health, Swiss Tropical and Public Health Institute, Basel, Switzerland; University of Basel, Basel, Switzerland.
6 Department of Infectious Disease Epidemiology, London School of Hygiene & Tropical Medicine, London, UK.