A container element that holds unstructured text within a bibliographic reference (<mixed-citation>); therefore, this is not necessarily a comment in the formal sense of commentary.
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Any combination of:
<ref-list>
<title>References</title>
<ref>
<mixed-citation publication-type="journal">
<person-group person-group-type="authors">
<string-name><surname>Nakazato</surname>, <given-names>K.</given-names></string-name>,
<string-name><surname>Shimonaka</surname>, <given-names>Y.</given-names></string-name>, &
<string-name><surname>Homma</surname>, <given-names>A.</given-names></string-name>
</person-group>
(<year>1992</year>).
<article-title>Cognitive functions of centenarians: The Tokyo Metropolitan Centenarian Study</article-title>.
<source>Japanese Journal of Developmental Psychology</source>,
<volume>3</volume>,
<fpage>9</fpage>-
<lpage>16</lpage>.
<comment>Abstract obtained from PsycSCAN: Neuropsychology, 1993, 2, Abstract No. 604.</comment>
</mixed-citation>
</ref>
</ref-list>
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