Concurrent validity of the pressure biofeedback unit and surface electromyography in measuring transversus abdominis muscle activity in patients with chronic nonspecific low back pain.
Lima PO, Oliveira RR, Moura Filho AG, Raposo MC, Costa LO, Laurentino GE. Rev Bras Fisioter. 2012 Jul 24. pii: S1413-35552012005000038. Free Article PMID: 22832703
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