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:2% of cases.(15) Further, the VTE detection rates reported here are also in line with large data sets from National (Nationwide) Inpatient Sample database reporting on results of benign brain tumor resection, making it likely that our results are valid in other clinical settings as well.
Category: