There are multiple definitions:

1. heme oxygenase(English)

   • a critical component of the defense mechanism to a wide variety of cellular stressors. HO induction affords cellular protection through the breakdown of toxic heme into metabolites, helping preserve cellular integrity
   • EPO, HO-1, NAFLD, HMOX1
   • Erythrocyte, Oxygen, Liver disease
   • https://doi.org…90/ijms21249493

2. hyperoxia(English)

   • refers to assessment of hemodynamic impairment in carotid occlusion patients
   • ALFF, fALFF, HC, HO-BOLD
   • Oxygen
   • https://doi.org…age.2018.06.017

3. hands-on(English)

   • CS, FFL, FNS, IS, NE, TE
   • Nutrition, Education
   • https://doi.org…neb.2020.12.015

4. heterotopic ossification(English)

   • ACDF, ASD, CADR, HS, JOA, NDI, ROM, VAS, AE, CAC, DDD, FDA, FSU, HPD, IDE, LP, MCS, NRS, PCS, SF-36
   • Spine (or spinal cord), Injury
   • https://doi.org…neu.2018.01.157
   • https://doi.org…6.10.SPINE16264