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. Programa Medicina Paliativa, Departamento Medicina Interna, Facultad de Medicina; Pontificia Universidad Católica de Chile; Santiago Chile
4. Department of Biostatistics; The University of Texas MD Anderson Cancer Center; Houston Texas
5. Department of Behavioral Science; The University of Texas MD Anderson Cancer Center; Houston Texas
6. Department of Palliative Care; Massachusetts General Hospital; Boston Massachusetts