| prevention | to reduce risk of disabling or imparing events |
|---|---|
| treatment | to cure diseases, to substitute missing substances |
| indispensable to life, to modify or relieve symptoms | |
| severity grading of the diseases: | |
| I. acute life-threatening or severe chronic disease | |
| II. rehabilitation | |
| III. less severe acute or chronic disease | |
| IV. application outside a treatment context |