There are multiple definitions:

1. occipitocervical fusion(English)

   • CSA, dCSA, JOA, O-C 2, OCF, POCA, VAS
   • Spine (or spinal cord), Surgery
   • https://doi.org/10.1111/os.12553

2. osteopathy in the cranial field(English)

   • ANS, BRS, CFS, CRI, CV4, CVH, HF, HRV, LF, MFHA, NTS, OCF, OCMM, OMT, PPG, PRM, retR, SBV, THW
   • Skeleton and bone (formation), Pathology, Brain (dys)function, Reflex
   • https://doi.org…al.pone.0317300