Media type: E-Article Title: Single-center trials tend to provide larger treatment effects than multicenter trials: a systematic review Contributor: Unverzagt, Susanne; Prondzinsky, Roland; Peinemann, Frank Published: Elsevier BV, 2013 Published in: Journal of Clinical Epidemiology, 66 (2013) 11, Seite 1271-1280 Language: English DOI: 10.1016/j.jclinepi.2013.05.016 ISSN: 0895-4356 Origination: Footnote: