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Appraising the evidence: what is selection bias?

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Sep 2007534525
Oct 2007684527
Nov 2007373421
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Jan 2008122316
Feb 20082274
Mar 2008311815
Apr 2008312412
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Jun 20082356
Jul 20082145
Aug 200816167
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Feb 20185861
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Dec 2018131613026
Jan 2019177118335
Feb 2019197415134
Mar 2019222321431
Apr 2019330039064
May 2019242824046
Jun 20199017624
Total2678335081210