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:To evaluate whether there may be a different discriminatory one that applies to bedside ultrasonography, we set up an nalysis similar to the one originally described by Kadar et al.(9) rom our total 256 patients, 161 (63%) were ultimately lassified after follow-up as having an intrauterine pregnancy hat was visualizable.
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