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                  href="/cgi/external_ref?id=pubmed_pcsubstance_mesh&amp;target=pcsubstance&amp;type=acheck&amp;pmid=11889143&amp;link_type=ENTREZLINKS">Substance via MeSH</a>
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                  href="/cgi/external_ref?id=MEDPLUS&amp;target=http%3A%2F%2Fwww.nlm.nih.gov%2Fmedlineplus%2Farrhythmia.html&amp;type=llinks&amp;pmid=11889143&amp;link_type=ENTREZLINKS">Arrhythmia</a>
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