* Professor and Chairman, Department of Anesthesiology, American University of Beirut, Beirut, Lebanon.
† Associate Professor of Surgery, Department Surgery, American University of Beirut, Beirut, Lebanon.
† Resident, Department of Anesthesiology, American University of Beirut, Beirut, Lebanon.
§ Assistant Professor, Department of Anesthesiology, American University of Beirut, Beirut, Lebanon.
∂ Associate Professor of Surgery, Division of Head and Neck Surgery, Harbor-UCLA Medical Center, Torrance, California, and the UCLA School of Medicine, Los Angeles, California.