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:Some international studies [39‚Äì41] that did assess the relationship between patients‚Äô knowledge about oral anticoagulants and anticoagulation control using the Rosendaal Method had results in line with our finding of no significant association between them, while a few other international surveys found that knowledge positively affects the INR control [23, 42, 43].
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