<?xml version="1.0" encoding="UTF-8" ?>
<keywords xmlns="http://eprints.org/ep2/data/2.0"><item>Pain</item><item>Primary care</item><item>Patients</item><item>Physicians</item><item>Hong Kong</item><item>Decision making</item><item>Knees</item><item>Randomized controlled trials</item></keywords>
