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Waffenschmidt, Siw 
ORCID: 0000-0001-6860-6699, Navarro-Ruan, Tamara, Hobson, Nick, Hausner, Elke, Sauerland, Stefan and Haynes, R. Brian
(2020).
Development and validation of study filters for identifying controlled non-randomized studies inPubMedand OvidMEDLINE.
Res. Synth. Methods, 11 (5).
S. 617 - 627.
HOBOKEN:
WILEY.
ISSN 1759-2887