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:Our results are in agreement with other authors who showed good antitumor effects in human xenografts after the application of a CD19 CD3 diabody [16], EPCAM CD3 diabody [14,17,18], or CEA CD3 diabody [19].
Category: