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Peinemann, Frank 
ORCID: 0000-0002-4727-1313, Tushabe, Doreen Allen and Kleijnen, Jos
(2013).
Using Multiple Types of Studies in Systematic Reviews of Health Care Interventions - A Systematic Review.
PLoS One, 8 (12).
SAN FRANCISCO:
PUBLIC LIBRARY SCIENCE.
ISSN 1932-6203