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In this article by Reto Nuesch and colleagues (21 July, pp
142-6) tables 1 and 2 contained incorrect values for several of the
patients' characteristics. The authors have now supplied revised values, and these can be found on the BMJ 's
website at bmj.com/cgi/content/full/323/7318/900/DC1 The conclusions of
the paper remain the same.