1. Laboratory of Complement Biology, New York Blood Center; New York; New York
2. Montefiore Medical Center, Albert Einstein College of Medicine; Bronx; New York
3. Pediatric Hematology; Columbia University Medical Center; New York; New York
4. Division of Pediatric Hematology-Oncology, Weill Cornell Medical College; New York; New York
5. Clinical Services, New York Blood Center; New York; New York