1. Health Services and Outcomes Research, National Healthcare Group, Singapore, Singapore.
2. Department of Respiratory and Critical Care Medicine, Tan Tock Seng Hospital, Singapore, Singapore.
3. Lee Kong Chian School of Medicine, Nanyang Technological University, Singapore, Singapore.
4. Department of Palliative Medicine, Tan Tock Seng Hospital, Singapore, Singapore.
5. The Palliative Care Centre for Excellence in Research and Education, Dover Park Hospice, Singapore, Singapore.