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Distinguishing Between Efficacy and Real-World Effectiveness: The Case for Thinking Beyond Classic Randomized Controlled Trial Design

Sites, Brian D. MD, MS; Masaracchia, Melissa M. MD; Davis, Matthew MPH, PhD

Regional Anesthesia & Pain Medicine: March/April 2017 - Volume 42 - Issue 2 - p 131–132
doi: 10.1097/AAP.0000000000000563