In Reply: While Dr Kadhiravan is correct in
the description of the NLM initiatives regarding the labeling of permanence
levels for URLs,1 unfortunately none of the
URL references in our study would have been affected by this change. Although
the citations evaluated were from 5 major medical journals, no citation referenced
an NLM URL. The referenced URLs included Web pages from commercial resources,
nonprofit organizations, and academic research and government Web-based sources.
Crichlow R, Winbush N. Permanence of Web Page References—Reply. JAMA. 2005;293(12):1450. doi:10.1001/jama.293.12.1450-b
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