"efficacy" - key terms from Wikipedia

antidepressant efficacy
business efficacy
clinical efficacy
comparative efficacy
efficacy
efficacy of bupropion
efficacy of extracorporeal
efficacy of glucosamine
efficacy of meningitis
efficacy of prolotherapy injections
efficacy of sertraline
efficacy than filament lamps
greater efficacy
luminous efficacy
luminous efficacy of a source
luminous efficacy of radiation
proven efficacy
safety and efficacy
safety or efficacy
self efficacy
superior efficacy