There are multiple definitions:

1. embryonic germ [cell](English)

   • ESC, PSC
   • Embryology /reproduction, Stem cell
   • https://dx.doi.…brainsci9020042

2. electroacupuncture group(English)

   • studied versus control group
   • EA, GAS, MTL, PONV, TBS, TFD, TFF, VIP
   • Gastroenterology, Alternative medicine
   • https://doi.org…55/2021/8329366

3. epiphora group(English)

   • AS-OCT
   • Ophthalmology
   • https://doi.org…55/2022/7988091

4. experimental group(English)

   • may refer to a comparative study
   • FA, DOP
   • Diet
   • https://doi.org…/jds.2017-12899

5. esophagogastric [cancer](English)

   • is the fifth most common malignancy, and its incidence is increasing
   • QOL
   • Mouth, esophagus and stomach, Oncology
   • https://doi.org…RIR-2016-003108