1. Medical Center for Dancers and Musicians, MC Haaglanden, Medical Centre for Dancers and Musicians (MCDM), The Hague Medical Centre, Postbox 432, 2501 CK The Hague, The Netherlands;, Email: abmrietveld@hetnet.nl
2. Medical Center for Dancers and Musicians, MC Haaglanden, The Hague, The Netherlands
3. Landsteiner Institute, MC Haaglanden, The Hague, The Netherlands
4. Department of Orthopedic Surgery, Leiden University Medical Center, Leiden, The Netherlands