| GISSI | Italian Study Group for the Prevention of Myocardial Infarction [Gruppo Italiano per lo Studio della... |
|---|---|
| GITSG | gastrointestinal tumor study group |
| HOT | health-oriented telecommunication; human old tuberculin; hyperbaric oxygen therapy; Hypertension Opt... |
| IASHS | Institute for Advanced Study in Human Sexuality |
| IASL | International Association for Study of the Liver |