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:Previous studies have published on the relationship between markers of ECM remodelling with CHD [5,6,29], but the results have been inconsistent with studies reporting either a positive or null effect while others have shown that markers of inflammation largely confound the association.
Category: