1. Department of Dermatology Northwestern University Feinberg School of Medicine 676 N. St Clair St, Suite 1600 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