What is the minimum number of included studies in a systematic review?

Visualisation of a Meta-Analysis in a Forest Plot (Review Manager)

This question has been asked with different wording:

  • How many studies do I need for my systematic review? Zero.
  • How many studies are enough for a meta-analysis? 2 or more (depends, read on).
  • Can I publish a systematic review with no studies? Yes.

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