| PF | pair feeding; peak flow; perfusion fluid; pericardial fluid; periosteal fibroblast; peritoneal fluid... |
|---|---|
| PHS | Physicians' Health Study; pooled human serum; posthypnotic suggestion; Public Health Service |
| R1, R2, R3, etc. | years of resident study |
| RFS | relapse-free survival; renal function study; rotating frame spectroscopy |
| RVS | rectovaginal space; relative value scale/study; reported visual sensation; retrovaginal space |