Author Contributions: Dr Scheinberg had full access to all of the data in the study and takes responsibility for the integrity of the data and the accuracy of the data analysis. Drs Scheinberg and Cooper contributed equally to this work.
Study concept and design: Scheinberg, Cooper, Wu, Calado, Young.
Acquisition of data: Scheinberg, Cooper, Sloand, Calado,Young.
Analysis and interpretation of data: Scheinberg, Cooper, Wu, Calado, Young.
Drafting of the manuscript: Scheinberg, Cooper, Calado, Young.
Critical revision of the manuscript for important intellectual content: Scheinberg, Cooper, Sloand, Wu, Calado, Young.
Statistical analysis: Wu, Calado.
Administrative, technical, or material support: Scheinberg, Sloand, Young.
Study supervision: Calado, Young.
Financial Disclosures: None reported.
Funding/Support: This research was supported by the Intramural Research Program of the National Institutes of Health; the National Heart, Lung, and Blood Institute. Dr Cooper's research year was made possible through the Clinical Research Training Program (CRTP), a public-private partnership supported jointly by the National Institutes of Health and Pfizer Inc (via a grant to the Foundation for National Institutes of Health from Pfizer Inc).
Role of the Sponsor: The sponsor had no role in the design and conduct of the study, collection, management, analysis, and interpretation of the data, and preparation, review, or approval of the manuscript.
Additional Contributions: We thank Olga Nuñez, RN, and Barbara Weinstein, RN, both from the Hematology Branch, National Heart, Lung, and Blood Institute, for patient care, sample collection, and handling. They did not receive separate compensation for their contribution.
This article was corrected online for typographical errors on 9/21/2010.