I am conducting a systematic review and meta-analysis of many studies with overlapping populations. The Review Manager 5.4 software does not require a sample size to perform a meta-analysis of hazard ratios, so I thought it may be possible to pool data from overlapping populations.
I am not sure of the meaning of "overlapping" term you mention. From my perspective, it seems that the same patients could be used twice as separate study findings? This type of problem is depicted in Cochrane training book 6.2.4 section (Chapter 6: Choosing effect measures and computing estimates of effect | Cochrane Training).
This situation could be accounted for in the meta-analysis and would have an effect on the standard error of the estimate (with hierarchical model accounting for repeated measurement it would increase the standard error of your pooled estimate). Practical info should be retrieved in (Chapter 10 “Multilevel” Meta-Analysis | Doing Meta-Analysis in R (bookdown.org)) using metafor package in R environment.
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