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:In the first iteration of the atlas generation, the JHU neonate brain single-subject atlas (resolution: 0.660.660.6 mm3, http:// lbam.med.jhmi.edu/) (Oishi et al., 2011) was used as initial atlas, where each subject’s T2-weighted image was aligned to via affine and nonlinear large deformation…
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