海量图书期刊资源，随时随地畅享阅读乐趣
Use of strategies to improve retention in primary care randomised trials: a qualitative study with in-depth interviewsBrueton, V. C.; Stevenson, F.; Vale, C. L.; Stenning, S. P.; Tierney, J. F.; Harding, S.; Nazareth, I.; Meredith, S.; Rait, G. · BMJ Open · 2014
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