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:Recent studies have shown that adipophilin is correlated with the activated inflammatory state of monocytes in subjects with a low level of high-density lipoprotein cholesterol (HDL-C) [22] and skin irritant cytotoxicity [23].
Category: