1. Pediatric Department (G.H., M.F., W.S., A.R.), Medical University of Vienna, A-1090 Vienna, Austria;
2. Department of Orthopedics (M.D., A.K.), Medical University of Vienna, A-1090 Vienna, Austria;
3. Department of Pathobiology (M.E.), Institute of Anatomy and Histology, University of Veterinary Medicine Vienna, A-1210 Vienna, Austria;
4. Clinical Institute of Pathology (G.A.) Medical University of Vienna, A-1090 Vienna, Austria
5. Department of Nuclear Medicine (A.S.), Medical University of Vienna, A-1090 Vienna, Austria