1. Marian Anderson Sickle Cell Center at St Christopher's Hospital for Children, Drexel University College of Medicine, Philadelphia, PA;
2. Critical Care Medicine Department, Clinical Center, National Institutes of Health (NIH), Bethesda, MD;
3. Johns Hopkins University, Baltimore, MD;
4. Transfusion Medicine, Department of Pathology, University of Illinois at Chicago;
5. Sickle Cell Pathology Unit, University of South Alabama, Mobile;
6. Basic Research Program, Science Applications International Corporation (SAIC)–Frederick, National Cancer Institute at Frederick (NCI-Frederick), MD;
7. Mouse Imaging Facility, National Institute of Neurological Disorders and Stroke, NIH, Bethesda, MD;
8. Vascular Medicine Branch, National Heart, Lung, and Blood Institute, NIH, Bethesda, MD;
9. Molecular Medicine Branch, National Institute of Diabetes and Digestive and Kidney Diseases, NIH, Bethesda, MD