1. University of Oslo, Oslo, Norway
2. Medical Faculty, University of Oslo, Oslo, Norway; Norwegian Institute of Public Health, Oslo, Norway; Ostfold Hospital Trust, Sarpsborg, Norway
3. Ohio State University, Columbus, USA
4. Oslo University Hospital, Oslo, Norway
5. Division of Paediatric and Adolescent Medicine, Oslo University Hospital, Oslo, Norway; Pediatric Department, Hargeisa Group Hospital, Hargeisa, Somaliland