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The reporting of studies conducted using observational rout..:

Langan, Sinéad M ; Schmidt, Sigrún Aj ; Wing, Kevin...
https://researchonline.lshtm.ac.uk/id/eprint/4650272/1/Langan_etal_2018-The-reporting-of-studies-conducted-using-observational-routinely.pdf.  , 2018