1. Department of Anesthesiology, Pain Management Center, Brigham & Women’s Hospital, Harvard Medical School, Chestnut Hill, MA 02467, USA
2. Orthopaedic and Arthritis Center for Outcomes Research, Department of Orthopaedic Surgery, Brigham & Women’s Hospital, Harvard Medical School, Boston, MA 02115, USA
3. Department of Psychology, The University of Alabama, Tuscaloosa, AL 35487, USA