There are multiple definitions:

1. external carotid artery(English)

   • CCA, ICA, ECA/CCA, ICA/CCA, ICA/ECA
   • Anatomy, Vascular disease, Gender aspects
   • https://doi.org…1.STR.32.7.1525

2. electrical control activity(English)

   • Regulation / control, Electrophysiology

3. epidemiological catchment area(English)

   • Epidemiology