The Spanish Version of the Functional Rating Index in Patients With Low Back Pain: Preliminary Results of the Validation Study by Ivan Medina-Porqueres, PT, RN, MSc, Manuel Torres-Fernandez, PR, Francisco J. Palenque-Lobato, PT, Nina Poljakovic-Kovacev, PR, Antonio Bellido-Da-Conceiçao, PT, Ronald J. Feise, DC, CEBC, Raquel Cantero-Tellez, PT, OT, PhD

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