Assertion: diaphragm's failure rate | /r/CapableOf | remain excessive
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text: By the early 1990s, long-term evaluations of the technology were being published, with some researchers such as Bach and O'Connor stating that phrenic nerve pacing is a valid option "for the properly screened patient but that expense, failure rate, morbidity and mortality remain excessive and that alternative methods of ventilatory support should be explored".