Why we need observational studies to evaluate the effectiveness of health care (Q24655465)
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(P1476) "Why we need observational studies to evaluate the effectiveness of health care" (language: en)

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External Links
(P356) 10.1136/BMJ.312.7040.1215
(P698) 8634569
(P932) 2350940
(P3181) 174196
(P5875) 14565130