There are multiple definitions:

1. urgent surgery followed by radiotherapy(English)

   • AMSCC, KFS
   • Spine (or spinal cord), Oncology, Surgery, Radiotherapy /radiation
   • https://doi.org…rroncol29100583

2. unstimulated salivary flow rate(English)

   • reduced salivary secretion and complaints of oral dryness could be signs of poor nutritional or general health status of elderly patients
   • SSFR
   • Nutrition, Aging, Frailty
   • https://doi.org…ageing/27.2.123