1. Alice Lee Centre for Nursing Studies, Yong Loo Lin School of Medicine, National University of Singapore, Level 2, Clinical Research Centre, Block MD11, 10 Medical Drive, Singapore 117597, Singapore
2. National University Health System, NUHS Tower Block, 1E Kent Ridge Rd, Singapore 119228, Singapore
3. Department of Nursing, School of Medicine, Xiamen University, Room 220, Alice Lee Building, Xiang An South Road, Xiang An District, Xiamen 361102, Fujian Province, China