1. Department of Orthopaedic Surgery, The University of Alabama at Birmingham Heersink School of Medicine, Birmingham, AL, USA
2. Department of Orthopaedic Surgery, Hughston Orthopaedic Clinic, Columbus, GA, USA
3. Department of Family and Community Medicine, The University of Alabama at Birmingham, Birmingham, AL, USA
4. Department of Orthopaedic Surgery, The University of Alabama at Birmingham, Birmingham, AL, USA