There are multiple definitions:

1. organ at risk(English)

   • PTV, BIC, DVH, VIF, MICE
   • Risk factor
   • https://doi.org…onc.2020.04.012

2. Otp, Aristaless, and Rax(English)

   • ALX
   • Genetics
   • https://doi.org…ene.2020.569314

3. Office of AIDS Research(English)

   • coordinates HIV/AIDS research across the National Institutes of Health. The NIH provides the largest public investment in HIV/AIDS research globally
   • AIDS, HIV, NIH, ORWH
   • AIDS, Organizations (research)
   • https://www.oar…/vision-mission

4. open aneurysm repair(English)

   • AAA, EVAR, rAAA
   • Vascular disease, Anatomy, Surgery
   • https://doi.org…rheartj/ehae665