*Department of Physical Therapy, International Spine Pain Institute, Story City, Iowa, USA
†Department of Physiotherapy, Stellenbosch University, Stellenbosch, South Africa
‡Department of Physical Therapy, Occupational Therapy, Rehabilitation and Physical Medicine, Universidad Rey Juan Carlos, Alcorcón, Madrid, Spain
§Department of Physical Therapy, University of Nevada Las Vegas, Las Vegas, Nevada, USA
Correspondence to: César Fernández de las Peñas, PT, PhD, Facultad de Ciencias de la Salud, Universidad Rey Juan Carlos, Avenida de Atenas s/n, 28922 Alcorcón, Madrid, Spain. Tel: + 34 91 488 88 84; Fax: + 34 91 488 89 57; E-mail: [email protected].
Conflicts of interest: There are no conflicts of interest to report.
All authors contributed to the study concept and design. Adriaan Louw and Emilio J. Puentedura did the main statistical analysis and interpretation of data. Adriaan Louw, Emilio J. Puentedura and César Fernández-de-las-Peñas contributed to draft the report. Adriaan Louw and Ina Diener obtained funding. Ina Diener provided administrative, technical, and material support. Emilio J. Puentedura and César Fernández-de-las-Peñas supervised the study. All authors revised the text for intellectual content and have read and approved the final version of the manuscript.
