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:This condition has been described variously, as intramural coronary artery, mural coronary artery, coronary artery overbridging, and most commonly myocardial bridging (MB) (Canyigit et al. 2009; Lazoura et al. 2010; Mohlenkamp et al. 2002; Montaudon et al. 2007; Ozbag et al. 2002; Ozbag and Kervancioglu 2004).
Category: