1 Department of Dermatology and Pediatrics, Mount Sinai St. Luke's-Roosevelt and Beth Israel Medical Centers, New York, NY, U.S.A. nsilverberg@juno.com.
2 Departments of Dermatology, Preventive Medicine and Medical Social Sciences, Northwestern University Feinberg School of Medicine, Chicago, IL, 60611, U.S.A.
3 Northwestern Medicine Multidisciplinary Eczema Center, Chicago, IL, 60611, U.S.A.