open-label extension study
open-label pilot study
open-label studies
open-label study
open-label trial
open-label trials
open-reading frames
open-source software
open-top chambers

opening
opening angle
opening displacement
opening polymerization
opening pressure
opening reaction
openness
operable breast cancer
operant conditioning
operant ethanol self-administration

operant paradigm
operant responding
operant self-administration
operated eyes
operated patients
operated side
operating
operating band
operating bandwidth
operating characteristic

operating characteristic analysis
operating characteristic curve
operating characteristic curve analysis
operating conditions
operating costs
operating curve
operating data
operating departments
operating efficiency
operating environment

operating frequency
operating income
operating lists