Gordon S. Smith, M.B., Ch.B., M.P.H., will present “Hangovers, trauma recidivism and gambling: Importance of data linkage” at 1 p.m. Friday, May 22, in room 1905 of the Health Sciences Center. Dr. Smith is a professor of epidemiology and public health at the University of Maryland School of Medicine and the National Study Center for Trauma and EMS.