1. Department of Endocrinology, Odense University Hospital , 5000 Odense C , Denmark
2. Department of Clinical Research, University of Southern Denmark , 5000 Odense C , Denmark
3. Department of Internal Medicine and Endocrinology, Aarhus University Hospital , 8200 Aarhus N , Denmark
4. Centre for Rare Diseases, Pediatric and Adolescent Medicine, Aarhus University Hospital , 8200 Aarhus N , Denmark
5. Division of Orthopaedics & Sports Medicine, Children's National Hospital , Washington, DC 20010 , USA
6. Department of Orthopedics, Hospital for Special Surgery , New York, NY 10021 , USA
7. Faculty of Medicine and University Hospital Cologne, Department of Pediatrics, University of Cologne , 50931 Cologne , Germany
8. Centre for Genomic and Experimental Medicine, Institute of Genetics and Cancer, University of Edinburgh , Edinburgh EH4 2XU , UK