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:According to previous data a better outcome with MMF has been demonstrated for non-Caucasian patients (Lee et al. 2010), with considering the fact that our patients were Caucasian, the present study results may put emphasis on the benefit and safety of long term use of MMF in Caucasian race.
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