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OA
OBS
Observation care
Obsessive-compulsive disorder
Obstetrics surgeries
Occupational health, infection prevention
OCD
Odansetron
Oliguria
Omentum
Omeprazole
Open donor nephrectomy
Ophthalmic surgery
Opioid antagonists
Opioid-nave patient
OPPS
Oral airway
Orchidectomy
Orchiectomy
Organic brain syndrome
Oromaxillofacial structure
Orotracheal sedation
Orthognathic surgery
Orthopedic surgery
OSA
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