Multiple Choice
400 patients suffering from chronic back pain were randomly assigned to one of two groups.Over a four-month period,the first group received acupuncture treatments and the second group received a placebo.Patients who received acupuncture treatments improved more than those who received the placebo.
A) Retrospective observational study
B) Experiment
C) Prospective observational study
Correct Answer:
Verified
Correct Answer:
Verified
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