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:Second, overall, results of the studies on the metabolic effects of Ramadan fasting in healthy pregnant women [21-35] (Tables 2) give enough evidence that accelerated starvation, especially in late pregnancy [24], exists during fasting day hours with evident low blood glucose, elevated beta-hydroxybutyrate [21,24,25,29,33], ketosis, and ketonemia [26,29].
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