A case for non-experimental studies.
van Rijswijk
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D018849:Controlled Clinical Trials as Topic / Q000592:standards*; D019317:Evidence-Based Medicine; D006801:Humans; D015404:Nursing Methodology Research / Q000592:standards*; D010030:Ostomy / Q000451:nursing*; D012107:Research Design / Q000592:standards*; D014947:Wounds and Injuries / Q000451:nursing*