| D/H | deuterium/hydrogen [ratio] |
|---|---|
| D/N | dextrose/nitrogen [ratio] |
| D/T | date of treatment; total ratio of deaths |
| E/C | endocystoscopy; enteric-coated; estrogen/creatinine ratio |
| ECR | effectiveness-cost ratio; electrocardiographic response; emergency care research; emergency chemical... |
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