1. Departments of Palliative Care, Rehabilitation, and Integrative Medicine, The University of Texas MD Anderson Cancer Center, Houston, Texas, USA
2. Siriraj Palliative Care Center, Faculty of Medicine Siriraj Hospital, Mahidol University, Bangkok, Thailand
3. Palliative Care and Continuing Care Program, Faculty of Medicine, Pontificia Universidad Catolica de Chile, Santiago, Chile
4. Departments of Biostatistics, The University of Texas MD Anderson Cancer Center, Houston, Texas, USA