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Journal Article
Mueller, Dirk, Sauerland, Stefan 
ORCID: 0000-0003-1048-796X, Neugebauer, Edmund A. M. and Immenroth, Marc
(2010).
Reported effects in randomized controlled trials were compared with those of nonrandomized trials in cholecystectomy.
J. Clin. Epidemiol., 63 (10).
S. 1082 - 1091.
NEW YORK:
ELSEVIER SCIENCE INC.
ISSN 1878-5921