Blinding in randomized controlled trials in general and abdominal surgery: protocol for a systematic review and empirical study.
Pascal ProbstKathrin GrummichPatrick HegerSteffen ZaschkePhillip KnebelAlexis UlrichMarkus W BüchlerMarkus K DienerPublished in: Systematic reviews (2016)
PROSPERO 2015: CRD42015026837.