1Biometry Research Group, Division of Cancer Prevention, National Cancer Institute, EPN 344, 6130 Executive Blvd MSC 7354, Bethesda, MD 20892-7354, USA. sb16i@nih.gov
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The paired availability design effectively reduces selection bias in medical research. This method, applied to epidural analgesia and Cesarean sections, showed results comparable to randomized trials, unlike concurrent controls.
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