Affiliation: | 1. Department of Dermatology, Northwestern University, Feinberg School of Medicine, , Chicago, IL, 60611 U.S.A;2. Massachusetts General Hospital, Harvard Medical School, , Boston, MA, U.S.A;3. Amgen Inc., , Thousand Oaks, CA, U.S.A;4. Outcomes Research, UnitedBioSource Corporation, , Bethesda, MD, U.S.A |