1. Department of Palliative Care and Rehabilitation Medicine, The University of Texas MD Anderson Cancer Center, Houston, Texas.
2. Department of Palliative Care, Centre Hospitalier de Lyon-Sud, Hospices Civils de Lyon, Lyon, France.
3. Department of Biostatistics, The University of Texas MD Anderson Cancer Center, Houston, Texas.
4. School of Nursing, The University of Texas Health Science Center at Houston, Houston, Texas.
5. Department of Behavioral Science, The University of Texas MD Anderson Cancer Center, Houston, Texas.