Reasons or excuses for avoiding meta-analysis in forest plots

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Integration of evidence from multiple meta-analyses: a primer on umbrella reviews, treatment networks and multiple treatments meta-analyses (2009, background): “This is extension of the debate about whether heterogeneous data can be combined in traditional meta-analyses.(34) Finally, one has to critically consider whether the data can be extra polated from large samples to individual patients and settings.”
Systematic Review. What is the evidence of the impact of microfinance on the well-being of poor people? (2011, background): “(2008) point out that the aim of SR and meta-analysis should not be limited solely to generating a single pooled estimate, but should extend to examining ‘consistency of effects’ as well as promoting ‘understanding of moderator variables, boundary conditions, and generalisability’ (Ioannidis et al. ”
Objectively measured physical capability levels and mortality: systematic review and meta-analysis (2010, methodology): “We have presented summary, overall estimates from meta-analyses despite this, as most effect estimates from individual studies were in the same direction and doing meta-analyses has been argued to still be appropriate.”
Long-term mental health of war-refugees: a systematic literature review (2015, unknown): “sources of heterogeneity [37–40].”