| NNIS | National Nosocomial Infections Study |
|---|---|
| NWTS | National Wilms' Tumor Study |
| PAS | para aminosalicylate; Parent Attitude Scale; patient administration system; patient appointments and... |
| PCS | palliative care service; Patient Care System; patterns of care study; pelvic congestion syndrome; ph... |
| PDS | pain-dysfunction syndrome; paroxysmal depolarizing shift; patient data system; Patient-Doctor Societ... |