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:Sepsis was defined according to the new consensus of the European Society of Intensive Care Medicine and the Society of Critical CareMedicine published in February 2016, with diagnosis based on the combination of infection and SOFA score ≥ 2 points [2].
Category: