1. Division of Population Health Sciences and Education; St. George's University of London; London United Kingdom
2. University of Nebraska College of Nursing; Omaha Nebraska
3. Fox Chase Cancer Center; Thomas Jefferson University; Philadelphia Pennsylvania
4. Musculoskeletal Health, Faculty of Health and Life Sciences; University of the West of England; Bristol United Kingdom
5. Expert Centre for Chronic Fatigue; Radboud University Nijmegen Medical Centre; Nijmegen the Netherlands
6. Outcomes Research Branch; Applied Research Program; Division of Cancer Control and Population Sciences; National Cancer Institute; Bethesda Maryland
7. Palliative Medicine, Division of Population Health Sciences and Education; St. George's University of London; London United Kingdom