edited by Hans Popper, M.D., Ph.D., Professor and Chairmain of the Department of Pathology, the Mount Sinai School of Medicine, Pathologist-in-Chief, the Mount Sinai Hospital, Professor of Pathology, College of Physicians and Surgeons, Columbia University, New York and Fenton Schaffner, M.D., M.S., Head of Liver Group, Department of Medicine, and Associate Attending Pathologist, the Mount Sinai Hospital, Assistant Professor of Pathology, College of Physicians and Surgeons, Columbia Univeristy, New York, with 55 contributors.