1 Department of Dermatology, Northwestern University Feinberg School of Medicine, Chicago, Ill.
2 Departments of Dermatology and Pediatrics, Northwestern University Feinberg School of Medicine, Chicago, Ill.
3 Department of Allergy and Pediatrics, Northwestern University Feinberg School of Medicine, Chicago, Ill.
4 Department of Dermatology, Preventive Medicine and Medical Social Sciences, Northwestern University Feinberg School of Medicine, Chicago, Ill. Electronic address: JonathanISilverberg@gmail.com.