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:This result is similar to those found in studies carried out in clinical/surgical ICUs, where coagulation failure (≤50,000 platelets) did not significantly affect the prognosis of the patient [9, 28, 38].
Category: