1 Department of Dermatology, Massachusetts General Hospital of Harvard Medical School, Boston, Mass; Division of Pediatric Dermatology, Children's Hospital Los Angeles, Keck School of Medicine of USC, Los Angeles, Calif.
2 Division of Pediatric Dermatology, Children's Hospital Los Angeles, Keck School of Medicine of USC, Los Angeles, Calif.
3 Division of Clinical Immunology and Allergy, Children's Hospital Los Angeles, Keck School of Medicine of USC, Los Angeles, Calif. Electronic address: nizadi@chla.usc.edu.