I am doing my first systematic review. I have included two different study types; cohort studies and RCTs.

Regarding the quality assessment. What is the best thing to do?

Should i assess the cohorts using e.g. the Newcastle-Ottawa scale and the RCTs using e.g. Cochrane risk-of-bias?

Or is there a combined quality assessment tool for use in these cases where different study types are included?

Is there any gold standard for this?

Thanks in advance

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