From the Division of Cell Biology, Department of Pediatrics, National Jewish Health, Denver.
Address reprint requests to Dr. Gelfand at the Division of Cell Biology, Department of Pediatrics, National Jewish Health, 1400 Jackson St., Denver, CO 80206, or at [email protected].
Dr. Gelfand reports receiving consulting fees from CSL Behring and Biotest. No other potential conflict of interest relevant to this article was reported.
Disclosure forms provided by the author are available with the full text of this article at NEJM.org.
