1. Department of Orthopaedic Surgery, Yong Loo Lin School of Medicine, National University of Singapore and University Spine Centre, University Orthopaedics, Hand and Reconstructive Microsurgery Cluster, National University Hospital, Singapore.
2. Department of Orthopaedic Surgery, University, St. Louis, MO, USA.
3. Department of Orthopaedic Surgery, Columbia University Medical Center, New York, NY, USA.