Gregori L, Yang H, Anderson S. Transfusion. 2011 Jun 3. doi: 10.1111/j.1537-2995.2011.03199.x. [Epub ahead of print]
Da Division of Emerging and Transfusion-Transmitted Diseases, Office of Blood Research and Review, Rockville, Maryland; e do Office of Biostatistics and Epidemiology, Center for Biologics Evaluation and Research, Food and Drug Administration, Rockville, Maryland.