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:, loss of energy, changes in appetite, tiredness), researchers recommend increasing this cut-off to 16 when measuring depressive symptoms in pregnancy (Holcomb et al. 1996; Salamero et al. 1994).
Category: