| S | Greek capital letter sigma; syphilis; summation of series |
|---|---|
| b/c | benefit/cost [ratio] |
| CBA | chronic bronchitis and asthma; cost-benefit analysis |
| CEA | carcinoembryonic antigen; carotid endarterectomy; cholesterol-esterifying activity; cost-effectivene... |
| COI | Central Obesity Index; certificate of insurance; cost of illness |