The author certifies that he has no commercial associations (eg, consultancies, stock ownership, equity interest, patent/licensing
arrangements, etc) that might pose a conflict of interest in connection with the submitted article. (Adapted with permission
of Lippincott Williams and Wilkins from Brand RA. Writing for Clinical Orthopaedics and Related Research. Clin Orthop Relat Res. 2003;413:1–7.)