1. Department of Palliative Care and Rehabilitation Medicine, University of Texas MD Anderson Cancer Center, Houston, Texas, USA
2. Department of Palliative Care, Tan Tock Seng Hospital, Singapore
3. Research Medical Library, University of Texas MD Anderson Cancer Center, Houston, Texas, USA
4. Department of Palliative Medicine, Seirei Hamamatsu General Hospital, Hamamatsu, Shizuoka, Japan
5. Oncological Palliative Medicine, Hematology-Oncology, Cantonal Hospital, St. Gallen, Switzerland