Why is the PubMed back pain an example of higher quality?

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The back pain example is published in a more reliable source than the piece on drug prices. The back pain example is a case report while the piece on drug prices is an anecdote. The back pain example is an opinion by an expert while the piece on drug prices is an anecdote. The back pain example is a systematic review of evidence while the piece on drug prices is a cross-sectional study.