Vinay Kumar, MBBS, MD, FRCPath, Alice Hogge and Arthur A. Baer Distinguished Service Professor of Pathology, Biologic Sciences Division and the Pritzker Medical School, The University of Chicago, Chicago, Illinois, USA, Abul K. Abbas, MBBS, Distinguished Professor and Chair, Department of Pathology, University of California San Francisco, San Francisco, California, Jon C. Aster, MD, PhD, Professor, Department of Pathology, Harvard Medical School; Brigham and Women's Hospital, Boston, Massachusetts, Andrea T Deyrup, M.D., Ph.D., Associate Professor Department of Pathology Duke University Medical Center and ABHIJIT DAS, MD, Associate Professor of Pathology, Janakpuri Super Speciality Hospital, New Delhi, India