Purposeful variable selection and stratification to impute missing Focused Assessment with Sonography for Trauma data in trauma research

Paul A. Fuchs, Deborah J. Del Junco, Erin E. Fox, John B. Holcomb, Mohammad H. Rahbar, Charles A. Wade, Louis H. Alarcon, Karen J. Brasel, Eileen M. Bulger, Mitchell J. Cohen, John G. Myers, Peter Muskat, Herb A. Phelan, Martin A. Schreiber, Bryan A. Cotton