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Gabel, Charles Philip; Melloh, Markus; Yelland, Michael; Burkett, Brendan; Roiko, Anne (2011). Predictive ability of a modified Örebro Musculoskeletal Pain Questionnaire in an acute/subacute low back pain working population. European spine journal, 20(3), pp. 449-457. Berlin: Springer 10.1007/s00586-010-1509-4
Gabel, Charles Philip; Melloh, Markus; Burkett, Brendan; Michener, Lori A (2011). The Lower Limb Functional Index: development and clinimetric properties. Physical therapy, 92(1), pp. 98-110. Alexandria, Va.: American Physical Therapy Association, Inc. 10.2522/ptj.20100199
