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: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.(1-30) If the patient shows no sign of systemic lymphoma after an evaluation by the oncologist, then the ocular tumor is addressed with complete excision plus cryotherapy if the mass is small and accessible (lymphoma of the conjunctiva or anterior orbit) or incisional biopsy and low-dose radiosurgery if the mass is large (posterior orbital tumors).
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