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Journal Article
Unverzagt, Susanne, Prondzinsky, Roland and Peinemann, Frank 
ORCID: 0000-0002-4727-1313
(2013).
Single-center trials tend to provide larger treatment effects than multicenter trials: a systematic review.
J. Clin. Epidemiol., 66 (11).
S. 1271 - 1281.
NEW YORK:
ELSEVIER SCIENCE INC.
ISSN 1878-5921