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Gabel, Charles Philip; Cuesta-Vargas, Antonio; Qian, Meihua; Vengust, Rok; Berlemann, Ulrich; Aghayev, Emin; Melloh, Markus (2017). The Oswestry Disability Index, confirmatory factor analysis in a sample of 35,263 verifies a one-factor structure but practicality issues remain. European spine journal, 26(8), pp. 2007-2013. Springer 10.1007/s00586-017-5179-3
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; Cuesta-Vargas, Antonio I (2011). Factor Structure of the Neck Disability Index. Spine, 36(21), p. 1815. Hagerstown, Md.: Lippincott Williams & Wilkins 10.1097/BRS.0b013e31822c0521
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
Melloh, Markus; Gabel, Charles Philip; Cuesta-Vargas, Antonio I (2011). Factor analysis findings for the QuickDASH. Re: Mehta S, MacDermid JC, Carlesso LC, et al. Concurrent validation of the DASH and the QuickDASH in comparison to neck-specific scales in patients with neck pain. Spine, 36(15), p. 1260. Hagerstown, Md.: Lippincott Williams & Wilkins 10.1097/BRS.0b013e31821bbd7c
