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1 day ago · A randomized controlled trial (or randomized control trial; [2] RCT) is a form of scientific experiment used to control factors not under direct experimental control. Examples of RCTs are clinical trials that compare the effects of drugs, surgical techniques, medical devices, diagnostic procedures, diets or other medical treatments.
1 day ago · Outer Manchuria (in Russian Far East) v. t. e. The Qing dynasty ( / tʃɪŋ / ching ), officially the Great Qing, [d] was a Manchu -led imperial dynasty of China and the last imperial dynasty in Chinese history. [e] The dynasty, proclaimed in Shenyang in 1636, [7] seized control of Beijing in 1644, which is considered the start of the dynasty's ...
