Complex interventions and their implications for systematic reviews: a pragmatic approach.
Petticrew M; Anderson L; Elder R; Grimshaw J; Hopkins D; Hahn R; Krause L; Kristjansson E; Mercer S; Sipe T; Tugwell P; Ueffing E; Waters E; Welch V; Journal Of Clinical Epidemiology, 2013, vol. 66, issue 11, p 1209, ISSN 18785921. ISBN 18785921.

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