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:Lymphoproliferative lesions include a wide range of diseases such as benign reactive lymphoid hyperplasia, atypical lymphoid hyperplasia, and lymphoma, based on varying degrees of histopathologic and immunophenotypic features.(1-30) The approach to treatment of a lymphoid tumor of the eye and its adnexa includes an assessment of the patient’s ocular and systemic status.
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