Columbia University Medical Center: Dr. Joshua Milner and Dr. Stephen Canfield (allergy/immunology), Dr. Jesse Ross and Dr. Scarlett Murphy (pulmonology), Dr. Justin Aaron (infectious disease), Dr. George Vlad and Dr. Anjali Saqi (pathology), Dr. Mary Salvatore (radiology). Frederick National Laboratory for Cancer Research, Neutrophil Monitoring Laboratory: Karen Lau and Kimberly Marshall-Batty. National Institutes of Health, National Institutes of Allergy, and Infectious Diseases: Dr. Steven Holland.