1. Departments of Oncology and of Biostatistics; Bioinformatics, and Biomathematics, Lombardi Comprehensive Cancer Center and Innovation Center for Biomedical Informatics, Georgetown University Medical Center; Washington DC USA
2. Amgen, Thousand Oaks; California USA
3. American Association for Cancer Research, Office of Science Policy and Government Affairs; Washington DC USA
4. Current address: Genentech; Washington DC USA
5. Biostatistics and Research Decision Sciences, Merck Research Laboratories; Kenilworth New Jersey USA