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Randomized controlled trial

experimental method designed to reduce bias, typically accomplished by randomly allocating subjects to two or more groups, with one being a control group

Pronunciation
/ˈrandəmʌɪzd kənˈtrəʊld ˈtrʌɪəl/
/ˈrændəˌmaɪzd kənˈtroʊld ˈtraɪəl/