title: Preface.
authors.affiliation: Section of Dermatopathology, Anatomic Pathology, Cleveland Clinic, Cleveland, OH, USA, Cleveland Clinic Department of Anatomic Pathology, 9500 Euclid Avenue, L25, Cleveland, OH 44195. Electronic address: billins@ccf.org.
authors.forename: Steven D
authors.initials: SD
authors.lastname: Billings