LinkOut is a service of NCBI that allows third parties to link specific NCBI database records to relevant web-accessible resources. Typically, publishers and other full-text providers use LinkOut to provide links from PubMed records to their online full-text journals.
This xml file refer to some journals, such as
- JTD: http://www.jthoracdis.com
- JGO: http://www.thejgo.org
- CJCR: http://www.cjcrbj.com
- QIMS: http://www.amepc.org/qims