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From the *National Primary Care Research and Development Centre, University of Manchester, Manchester, United Kingdom; †Nuffield Orthopaedic Centre, Oxford, United Kingdom. Address reprint requests to Martin Roland National Primary Care Research and Development Centre University of Manchester Williamson Building, Oxford Road Manchester M13 9PL, UK E-mail: email protected Some of the text of this article has been derived, with permission, from Fairbank and Pynsent. 31
Roland et al. (Fri,) studied this question.