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1) This study was a “single-blind” randomized trial

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1) This study was a “single-blind” randomized trial. How does this differ from a double-blind study? Which kind of bias might it introduce into the study?

2) The sample was recruited from two different physical sites and levels of care. Which kind of bias might this introduce into the study?

3) There were considerable inclusion and exclusion criteria for sample selection. Which element of potential bias did each criterion address?