ignore duplicates from update publications.  one source provides a medline id as a pubmed id.  We also have the same publication by pubmed id, retrieval from entrez gets the same record twice.
ignore duplicates from update publications.  one source provides a medline id as a pubmed id.  We also have the same publication by pubmed id, retrieval from entrez gets the same record twice.



Former-commit-id: 01cb8da419d9a3f85dc1208ee507daa2d32a7b92
julie-sullivan/phytomine,julie-sullivan/phytomine,julie-sullivan/phytomine,julie-sullivan/phytomine,julie-sullivan/phytomine,julie-sullivan/phytomine,julie-sullivan/phytomine