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Koensgen, Nadja, Polus, Stephanie, Rombey, Tanja 
ORCID: 0000-0001-5777-9738 and Pieper, Dawid
(2019).
Clowning in children undergoing potentially anxiety-provoking procedures: a systematic review and meta-analysis.
Syst. Rev., 8.
LONDON:
BMC.
ISSN 2046-4053