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:014-inch guidewire as described (14,15); 2) after the wire connected the 2 large blood vessels, we implanted a covered stent (“endograft”) to bridge the 2 vessels; and 3) BMS anchoring was used as an SVC end-to-end anastomosis landing zone and to secure the right PA end-to-side anastomosis.
Category: