1. From the Department of Clinical Science and Education Karolinska Institutet StockholmSweden
2. Sachs’ Children and Youth Hospital StockholmSweden
3. Department of Medicine Clinical Epidemiological Unit Karolinska Institutet StockholmSweden
4. Division of Paediatrics Department of Biomedical and Clinical Sciences Linköping University LinköpingSweden
5. Crown Princess Victoria Children’s Hospital LinköpingSweden
6. Department of Molecular and Clinical Medicine Institute of Medicine University of Gothenburg GothenburgSweden
7. Centre of Registers in Region Västra Götaland GothenburgSweden
8. Department of Medicine NU Hospital Group Uddevalla Sweden