In reply: Chow criticises us for not identifying all relevant trials. But is she willing to help others in the process of reviewing? We could not identify a systematic review of the area with her involvement, nor does she appear to have registered an appropriate protocol with the Cochrane Collaboration (instructions for which are available at <http://www.cochrane.de>). Systematic reviews are important to help clinicians make sense of a diversity of trials. If experts such as she, devoting years to the area, do not help us, who should?
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