Marvin Wei Jie Chua1, Bin Chet Toh2. 1. Endocrinology Service, Department of General Medicine, Sengkang General Hospital, 110 Sengkang East Way, Singapore, 544886, Singapore. marvin.chua.w.j@singhealth.com.sg. 2. Upper Gastrointestinal and Bariatric Service, Department of General Surgery, Sengkang General Hospital, 110 Sengkang East Way, Singapore, 544886, Singapore.