Abstract
[...]the exclusion of these patients in PSM may lead to poor sample representation and affect the external validity of these results. [...]the authors pointed out that our PSM might have negatively affected the external validity of our results since only a subgroup of patients was included in the matched analysis. [...]we have computed the E-value which represents the magnitude of a potential unmeasured factor in the risk ratio scale to explain away the observed effect [9].
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