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:It is well known that platelet adhesion to pFN, mediated by aIIbb3 with contributions from a5b1 and other integrins, plays a critical role for hemostasis (Wang et al., 2014; Ni et al., 2003b).
Category: