Jun Hao Tan1, Gabriel Liu2. 1. Department of Orthopaedic Surgery, University Spine Centre, National University Hospital, National University Health System, 1 E Kent Ridge Road, Singapore, 119228, Singapore. junhao_tan@nuhs.edu.sg. 2. Department of Orthopaedic Surgery, University Spine Centre, National University Hospital, National University Health System, 1 E Kent Ridge Road, Singapore, 119228, Singapore.