1. Interuniversity Centre for Health Economics Research, Vrije Universiteit Brussel, Brussels, Belgium;
2. Strategic Information Department, UZ Brussel, Brussels, Belgium;
3. Department of Physiotherapy Human Physiology and Anatomy, Brussels Vrije Universiteit, Brussel, Belgium;
4. Emergency and Disaster Medicine, Department of Emergency Medicine, UZ Brussel, Brussel, Belgium;
5. Medical Registration, UZ Brussel, Brussels, Belgium;
6. Deptartment of Orthopaedics and Traumatol, UZ Brussel, Brussels, Belgium;
7. Biostatistics and Medical Informatics Department, Vrije Universiteit Brussel, Brussels, Belgium