There are multiple definitions:

1. scanning impedance imaging(English)

   • Impedance/bioimpedance, Medical imaging
   • https://doi.org…608x.w1425.pub2

2. secondary somatosensory cortex(English)

   • SI
   • Brain (dys)function
   • https://doi.org…-4446-2018-0183

3. systemic immune‐inflammation index(English)

   • a biomarker that reflect systemic inflammation, and may be applied to risk stratification and patient selection in ATAD patients before surgery
   • ATAD, TBAD, NHANES, SIRI
   • Biomarker, Immunology, Inflammasome, Dentistry
   • https://doi.org…1111/jocs.16300
   • https://doi.org…784-024-05529-1

4. slope index of inequality(English)

   • SES, RII, HRQoL
   • Dentistry, Hygiene
   • https://doi.org…2939-016-0423-8
   • https://doi.org…520-024-08341-5