What kind of article is this? All articles should have types assigned if possible.
<!ENTITY % article-types "article-commentary | abstract | addendum | announcement | book-review | books-received | brief-report | calendar | case-report | correction | discussion | editorial | in-brief | introduction | letter | meeting-report | news | obituary | oration | other | product-review | research-article | retraction | reply | review-article" >
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