1. Institute of Environmental Medicine, Karolinska Institutet, Stockholm, Sweden
2. Maternal and Child Health Division, International Centre for Diarrhoeal Disease Research, Dhaka, Bangladesh
3. Department of Medical Epidemiology and Biostatistics, Karolinska Institutet, Stockholm, Sweden
4. Department of Women’s and Children’s Health, Uppsala University, Uppsala, Sweden
5. London School of Hygiene and Tropical Medicine, London, UK