Acknowledgements
This study was conducted by the Eastern Cooperative Oncology Group (Robert L. Comis, M.D., Chair) and supported in part by Public Health Service Grants CA21115, CA23318, CA66636, CA21076, CA16116, CA13650 and from the National Cancer Institute, National Institutes of Health and the Department of Health and Human Services.
Its contents are solely the responsibility of the authors and do not necessarily represent the official views of the National Cancer Institute.
Potential conflict of interest:
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