1. Oslo Centre for Biostatistics and Epidemiology, University of Oslo, Oslo, Norway
2. Department of Method Development and Analytics, Norwegian Institute of Public Health, Oslo, Norway
3. Norwegian Computing Center, Oslo, Norway
4. Telenor Research, Oslo, Norway
5. International Centre for Diarrhoeal Disease Research, Bangladesh, ICDDR,B, Dhaka, Bangladesh
6. Department of Epidemiology, Johns Hopkins Bloomberg School of Public Health, Baltimore, MD, USA
7. Oslo Centre for Biostatistics and Epidemiology, Oslo University Hospital, Oslo, Norway