1. World Health Organization Cancer Care Program, Birmingham, AL 35211, USA
2. Helsinn Therapeutics, Iselin, NJ 08830, USA
3. Department of Clinical Science & Community, Section of Medical Statistics, Biometry & Epidemiology “G.A. Maccacaro”, University of Milan, Milan, Italy
4. Oncology Supportive Care Consultant, Overland Park, KS 66212, USA
5. Helsinn Healthcare, Lugano, Switzerland
6. Massachusetts General Hospital Cancer Center, Massachusetts General Hospital, Boston, MA 02114, USA