1. Department of Surgery, The Johns Hopkins Medical Institutions, Baltimore, Maryland.
2. Department of Oncology Biostatistics, The Johns Hopkins Medical Institutions, Baltimore, Maryland.
3. Department of Oncology, The Johns Hopkins Medical Institutions, Baltimore, Maryland.
4. Molecular Diagnostic Laboratory, Department of Clinical Biochemistry, Aarhus University Hospital, Skejby, Denmark.
5. Department of Pathology, The Johns Hopkins Medical Institutions, Baltimore, Maryland.
6. Department of Oncology, The Johns Hopkins Medical Institutions, Baltimore,Maryland.