1 Department of Gastroenterology and Hepatology, Singapore General Hospital, Singapore; Duke-NUS Medical School, Singapore.
2 Department of Anaesthesiology and Perioperative Medicine, Singapore General Hospital, Singapore.
3 Department of Endocrinology, Singapore General Hospital, Singapore.
4 Department of Urology, Singapore General Hospital, Singapore.
5 Duke-NUS Medical School, Singapore; Department of Anaesthesiology and Perioperative Medicine, Singapore General Hospital, Singapore. Electronic address: hairil.rizal.abdullah@singhealth.com.sg.