Affiliation: | 1. American Hip Institute, Westmont, Illinois, U.S.A.;2. University of Illinois-Chicago, Department of Orthopaedics, Chicago, Illinois, U.S.A.;3. Loyola University Stritch School of Medicine, Maywood, Illinois, U.S.A.;4. Hinsdale Orthopaedics, Westmont, Illinois, U.S.A. |