Bugs with Pubmed Central translator
For papers scraped from the Pubmed Central website the Pages field isn't filled in and neither is the journal abbrevation (Journal Abbr) field.
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http://www.ncbi.nlm.nih.gov/pubmed/18506993?ordinalpos=1&itool=EntrezSystem2.PEntrez.Pubmed.Pubmed_ResultsPanel.Pubmed_RVDocSum
Rev Belge Med Dent.
PubmedArticle/MedlineCitation/MedlineJournalInfo/MedlineTA
I also found a description of the XML format used:
http://www.nlm.nih.gov/bsd/licensee/catrecordxml_element_desc2.html > search for MedlineTA
P.S. After writing this comment I just saw this issue is already fixed: https://www.zotero.org/trac/changeset/3286, so you can just wait 24 hours for your copy of Zotero to auto-update or you can update your translators directly by hand by clicking the translator update button found in the Zotero preferences.