Evaluate the collective function of references cited together in a given text segment.
Classify their combined role into one of the following categories: 'method', 'background', or 'result'.

Text:In addition, previous studies have shown that myocardial scar size and characteristics predict spontaneous ventricular arrhythmias in patients with an ischemic cardiomyopathy [25–28] which can result in worse survival independent of LV functional improvement.
Category: