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  icon Rare
  icon Not so common
  icon Common
  icon Low morbidity
  icon Considerable morbidity
  icon Serious

Klaus Wolff
Professor and Chairman Emeritus
Department of Dermatology
Medical University of Vienna
Chief Emeritus, Dermatology Service
General Hospital of Vienna
Vienna, Austria

Richard Allen Johnson
Clinical Instructor and Associate in Dermatology
Massachusetts General Hospital
Harvard Medical School
Boston, Massachusetts

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