Efficacy and effectiveness trials have different goals, use different tools, and generate different messages [Corrigendum]
Porzsolt F, Rocha NG, Toledo-Arruda AC, et al. Pragmatic and Observational Research. 2015;6:47–54.
The authors wish to advise that the Introduction section is missing this final sentence: on page 48, left column, line 34, “A short movie provides additional information on this topic https://drive.google.com/file/d/0B9MPdcimmmmpQkQ0cjdKNDk0R0U/view”.
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