1 Yong Loo Lin School of Medicine, National University of Singapore, 10 Medical Dr, 117597, Singapore.
2 Sengkang General Hospital, Singapore.
3 Yong Loo Lin School of Medicine, National University of Singapore, 10 Medical Dr, 117597, Singapore; Division of Colorectal Surgery, Department of Surgery, University Surgical Cluster, National University Hospital, 1E Kent Ridge Road, 119228, Singapore. Electronic address: choon_seng_chong@nuhs.edu.sg.
4 Division of Colorectal Surgery, Department of Surgery, University Surgical Cluster, National University Hospital, 1E Kent Ridge Road, 119228, Singapore.