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:Our results provide guidance to clinicians and patients as they demonstrate that the changes in bleeding and/or spotting days observed following insertion of the LNG-IUS in women with HMB follows a similar pattern to that observed in women using the intrauterine system for contraception [1,4,5,21], except that women with HMB may have more B/S days over the first year of use (see below).
Category: