William C. Faquin, MD, PhDMassachusetts General Hospital, Department of Pathology, Boston, MA, USAEsther Diana Rossi, MD, PhDFondazione Policlinico Universitario A. Gemelli, Unita’ Operativa Istopatologia e Citodiagnostica, Rome, ItalyZubair Baloch, MDUniversity of Pennsylvania Medical Center, Department of Pathology & Laboratory Medicine, Philadelphia, PA, USA Güliz A. Barkan, MDLoyola University Medical Center, Department of Pathology, Maywood, IL, USAMaria P. Foschini, MDUniversity of Bologna, Department of Biomedical and Neuromotor Sciences, Bellaria Hospital, Anatomic Pathology Unit, Bologna, ItalyDaniel F.I. Kurtycz, MDUniversity of Wisconsin School of Medicine and Public Health, Department of Pathology and Laboratory Medicine, Madison, WI, USAMarc Pusztaszeri, MDJewish General Hospital and McGill University, Department of Pathology,Montréal, Québec, Canada Philippe Vielh, MD, PhD, FIACNational Laboratory of Health, Department of Anatomic and Molecular Pathology, Dudelange, Luxembourg