1 Department of Immunobiology, Yale University School of Medicine, New Haven, Conn.
2 Department of Medicine, Division of Allergy and Immunology, Northwestern University Feinberg School of Medicine, Chicago, Ill.
3 Department of Immunobiology, Yale University School of Medicine, New Haven, Conn; Department of Medicine, Division of Allergy and Immunology, Northwestern University Feinberg School of Medicine, Chicago, Ill.