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In the article Randomised clinical trial: yoga vs written self-care advice for ulcerative colitis. (Aliment Pharmacol Ther., April 2017), 77 patients with ulcerative colitis were randomly assigned to yoga or written self-care advice.

"The yoga group had significantly higher disease-specific quality of life compared to the self-care group after 12 weeks."

Which best describes the type of study?

a. An observational study comparing two populations

b. An experiment comparing two treatments

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