1. Department of Palliative Care and Rehabilitation Medicine, Unit 1414, The University of Texas MD Anderson Cancer Center, Houston, Texas.
2. Siriraj Palliative Care Center, Faculty of Medicine Siriraj Hospital, Mahidol University, Bangkok, Thailand.
3. Department of Pulmonary Medicine, The University of Texas MD Anderson Cancer Center, Houston, Texas.
4. Research Center for Nursing Research, University of Texas Health School of Nursing, Houston, Texas.
5. Department of Biostatistics, The University of Texas MD Anderson Cancer Center, Houston, Texas.