1 Department of Dermatology, San Diego School of Medicine, University of California, La Jolla, California; Rady Children's Hospital San Diego, San Diego, California.
2 Department of Dermatology, Indiana University School of Medicine, Indianapolis, Indiana.
3 Department of Dermatology, University of California, San Francisco, San Francisco, California.
4 Rady Children's Hospital San Diego, San Diego, California.
5 Pfizer Inc., Collegeville, Pennsylvania.
6 Department of Dermatology, San Diego School of Medicine, University of California, La Jolla, California; Rady Children's Hospital San Diego, San Diego, California; Department of Pediatrics, San Diego School of Medicine, University of California, La Jolla, California. Electronic address: leichenfield@rchsd.org.