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Müller, Monika; D'Addario, Maddalena; Egger, Matthias; Cevallos, Myriam; Dekkers, Olaf; Mugglin, Catrina; Scott, Pippa (2018). Methods to systematically review and meta-analyse observational studies: a systematic scoping review of recommendations. BMC Medical research methodology, 18(1), p. 44. BioMed Central 10.1186/s12874-018-0495-9
