A Study's Hypothesis That a New Surgical Approach Produces Safer

A study's hypothesis that a new surgical approach produces safer outcomes in immunosuppressed patients is tested in a 14-site research study across the United States. Subjects at all sites are randomly selected and randomly assigned to experimental versus control groups. What strategy is used in this research project?

A) Quasi-experimental design
B) Randomized-controlled trial
C) Model testing design
D) Counterbalancing

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