1. Department of Paediatrics, Östersund Hospital, Östersund, Sweden.
2. Department of Clinical Sciences, Lund University/CRC, Malmö, Sweden.
3. Department of Paediatrics, Kristianstad Hospital, Kristianstad, Sweden.
4. Department of Paediatrics, Ängelholm Hospital, Ängelholm, Sweden.
5. Department of Paediatrics, Ystad Hospital, Ystad, Sweden.
6. Department of Paediatrics, Helsingborg Hospital, Helsingborg, Sweden.