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:She had neither clinical and laboratory findings of infection as tuberculosis, or protein-losing enteropathy, regional ileitis, cirrhosis, sarcoidosis, amyloidosis, thrombosis of the superior vena cava, heart failure, nephrotic syndrome, Behcet’s disease, and malignancy nor a history of surgery or traumatic etiology for chylous ascites and chylothorax [2, 3].
Category: