There are multiple definitions:

1. reference planning volume(English)

   • Radiotherapy /radiation

2. rilpivirine(English)

   • used to investigate the potential of NNRTIs for treatment of FIV infection
   • EFV, FIV, HIV, NNRTI, NVP, SPR
   • Virology, Veterinary medicine
   • https://doi.org….4142/jvs.22326