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:These results are in line with several nested case control studies among survivors of adult cancers, which also demonstrated increased risks of subsequent GI cancer associated with RT as well as linear radiation dose‚Äìresponse relationships for stomach cancer among studies in survivors of testicular cancer [55], Hodgkin lymphoma [56], both testicular cancer and Hodgkin lymphoma [57], and cervical cancer [58], for esophageal cancer among survivors of Hodgkin lymphoma [59] and breast cancer [60], and for pancreatic cancer among Hodgkin lymphoma survivors [61].
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