1. University of Gothenburg Institute of Clinical Sciences: Goteborgs universitet Institutionen for kliniska vetenskaper
2. Department of Pediatric Surgery, Karolinska University Hospital, Stockholm
3. Department of Women and Children's Health Uppsala University, Uppsala
4. Department of Pediatric Surgery, Queen Silvia Children's Hospital: Sahlgrenska universitetssjukhuset Drottning Silvias barn- och ungdomssjukhus, Gothenburg
5. Department of Pediatric Surgery, Queen Silvia Children's Hospital: Sahlgrenska universitetssjukhuset Drottning Silvias barn- och ungdomssjukhus, Gothenburg, Sweden
6. Department of Pediatrics Lund University, Department of Pediatric Surgery, Skane University Hospital, Lund
7. Karolinska Institutet Department of Women's and Children's Health: Karolinska Institutet Institutionen for kvinnors och barns halsa