1. Institute of Clinical Medicine University of Oslo Oslo Norway
2. Department of Dermatology Oslo University Hospital Oslo Norway
3. Department of Pediatrics Oslo University Hospital Oslo Norway
4. Department of Biostatistics and Epidemiology Oslo University Hospital Oslo Norway
5. University of Oslo Oslo Norway
6. Department of Pediatrics Elverum Hospital Elverum Norway
7. Department of Pediatrics Østfold Hospital Fredrikstad Norway
8. Department of Molecular Medicine Karolinska Institute at Karolinska Hospital Stockholm Sweden
9. Hormone Laboratory Department of Medical Biochemistry Oslo University Hospital Oslo Norway