There are multiple definitions:

1. Near East and North Africa(English)

   • COVID-19
   • Environment, Epidemiology
   • https://doi.org…0/foods13020297

2. nitrate ethyl nitramine(English)

   • ETPE, GAP
   • Materials science
   • https://doi.org…0/polym15183656

3. NSLA without EGFR and No ALK alterations(English)

   • ALK, EGFR, EPIC, KRAS, NSLA, WGS
   • Pulmonology, Oncology, Biomarker
   • https://doi.org…472.CAN-23-1551

4. N-ethyl-2-naphthylamine(English)

   • BPO
   • Spectrometry
   • https://doi.org…9140(94)00219-i