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- Randomized clinical trials 2
- Randomized control trails 1
- Randomized controlled clinical trials 1
- Randomized controlled methods 1
- Randomized controlled trail 2
- Randomized Controlled Trial 8
- Randomized controlled trial 14
- Randomized controlled trialed 1
- Randomized Controlled trials 1
- Randomized controlled trials 88
- Randomized Controlled Trials as Topic 10
- Randomized controlled trials as topic 1
- Rat 4
- Rates 1
- Rats 8
- Rats, Inbred Strains 2
- Rats, Sprague-Dawley 1
- Reactions 1
- Reagent Kits, Diagnostic 2
- Reagent kits, diagnostic 1