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Ovid MEDLINE: http://www.hsls.pitt.edu/resources/ovid/ PubMed: http://www.ncbi.nlm.nih.gov/sites/entrez?holding=upittlib FDA: http://www.fda.gov/cder/guidance/iche6.htm Clinical Research Office for Surgery and Trauma (CROST), University of Pittsburgh, Department of Surgery: http://www.surgery.upmc.edu/General/research.htm
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