| PES | Patient Escort Service; photoelectron spectroscopy; physicians' equity services; polyethylene sulfon... |
|---|---|
| PHLS | Public Health Laboratory Service |
| PHS | Physicians' Health Study; pooled human serum; posthypnotic suggestion; Public Health Service |
| PMRS | physical medicine and rehabilitation service |
| POS | periosteal osteosarcoma; physician order set; point of service; polycystic ovary syndrome; psychoorg... |