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We read with interest the article by Schmidt et al.1 We applaud the authors for undertaking this large and complex study and for highlighting the great potential of newer technologies for improving patient care.
We hoped the authors could clarify some key issues. First, only 1 year’s mortality data are used as a baseline comparator. Mortality fluctuates by year as this paper highlights, and can …
Contributors All authors contributed equally to the design and composition of the manuscript.
Competing interests None.
Provenance and peer review Not commissioned; internally peer reviewed.