1. Department of Orthopaedics and Traumatology, Tan Tock Seng Hospital, Jalan Tan Tock Seng, Singapore
2. Department of Orthopaedics, Singapore General Hospital, Outram Road, Singapore
3. Leicester royal infirmary, Department of Orthopaedics, Leicester, United Kingdom
4. Department of Orthopaedics, National University Hospital, Singapore