| EOP | efficiency of plating; emergency outpatient |
|---|---|
| ER | efficiency ratio; epigastric region; ejection rate; electroresection; emergency room; endoplasmic re... |
| HEPA | high-efficiency particulate air [filter] |
| PEI | Patient Exit Interview; phosphate excretion index; physical efficiency index; polyethyleneimine |
| PER | peak ejection rate; periodogram; protein efficiency ratio |