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:Particularly, in non-psychiatric patients, it has repeatedly been found that an increased use of maladaptive strategies, like avoidant coping and/or decreased use of adaptive strategies involving emotionfocused or problem-focused strategies were associated with suicidal behaviour (D’Zurilla et al., 1998; Li & Zhang, 2012; Pietrzak et al., 2011; Sugawara et al., 2012; Tang & Qin, 2015).
Category: