1. Department of Gastrointestinal Medical Oncology; The University of Texas MD Anderson Cancer Center; Houston Texas
2. Department of Medicine; University of Pittsburgh Medical Center; Pittsburgh Pennsylvania
3. Department of Thoracic/Head and Neck Medical Oncology; The University of Texas MD Anderson Cancer Center; Houston Texas
4. Department of Oncology; Haukeland University Hospital; Bergen Norway
5. Department of Clinical Science; University of Bergen; Bergen Norway