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:Fluoroscopy-guided anterior scalene (ASM) or pectoalis minor (PM) muscle blocks, or both, with local aneshetic were frequently used to help reinforce the clinical iagnosis of NTOS and to provide additional insight into he likely responsiveness to treatment.(7,11) All patients not reviously treated for NTOS and those for whom previous hysical therapy did not appear to have been suitably tareted toward NTOS, underwent a 4- to 6-week course of TOS-specific physical therapy overseen by a therapist ith experience and expertise in the management of TOS.
Category: