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Line 23: \|date=September 1997 \| pmid = 9310563 \| url= \| pmc = 2127453▼ ~~\| url = http://www.bmj.com/cgi/content/full/315/7109/629~~ ▲ \| pmc = 2127453 \| doi=10.1136/bmj.315.7109.629 }}</ref><ref name="SterneJ2001Funnel">{{Cite journal

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