1. Neurosurgery Unit, Department of Surgery, Faculty of Medicine, Universiti Kebangsaan Malaysia Medical Centre, Kuala Lumpur, Malaysia
2. Department of Orthopaedics and Traumatology, Faculty of Medicine, Universiti Kebangsaan Malaysia Medical Centre, Kuala Lumpur, Malaysia
3. Department of Orthopaedic, KPJ Selangor Specialist Hospital, Selangor, Malaysia
4. Department of Orthopaedic, KPJ Ampang Puteri Specialist Hospital, Selangor, Malaysia
5. Prince Court Medical Centre, Kuala Lumpur, Malaysia
6. Department of Orthopaedics and Traumatology, Hospital Serdang, Selangor, Malaysia
7. Department of Orthopaedics and Traumatology, Hospital Pengajar Universiti Putra Malaysia, Selangor, Malaysia
8. Department of Orthopaedic, Avisena Specialist Hospital, Selangor, Malaysia
9. Singapore Clinical Research Institute, Singapore, Singapore