3841789 non-RCTs non-randomized controlled trials 86 3841787 non-RCTs non randomized controlled clinical trials 2 3841785 non-RCTs nonrandomized comparative trials 2 3841791 non-RCTs non-clinical randomized controlled trials 1 3841786 non-RCTs non-equivalent control group designs 1 3841788 non-RCTs non-randomized concurrent controlled trials 1 3841784 non-RCTs non-randomized controlled trials of interventions 1 3841790 non-RCTs Non-Randomized Studies of Interventions and the Newcastle-Ottawa scale 1