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:Finally, quantitative analyses were restricted to EHMs with a latency larger than 65 ms (rejecting 11 responses out of 251), which is the shortest visuo-motor delay based on the estimates of afferent and efferent delays of SC motor neurons (Guitton & Munoz, 1991; Munoz et al., 1991).
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