1. Changi General Hospital, 2 Simei Street 3, Singapore 529889, Singapore
2. Alice Lee Centre for Nursing Studies, Yong Loo Lin School of Medicine, National University of Singapore, Level 3, Clinical Research Centre, Block MD11, 10 Medical Drive, Singapore 117597, Singapore
3. Tan Tock Seng Hospital, 11 Jalan Tan Tock Seng, Singapore 308433, Singapore