Qin Xiang Ng1,2, Wee Song Yeo3,4, Vivekanandan Sivalingam2. 1. MOH Holdings Pte Ltd, Singapore, Singapore. 2. Institute of Mental Health, Singapore, Singapore. 3. National University Hospital, National University Health System, Singapore, Singapore. 4. Yong Loo Lin School of Medicine, National University of Singapore, Singapore, Singapore.