The 3-Month Effectiveness of a Stratified Blended Physiotherapy Intervention in Patients With Nonspecific Low Back Pain: Cluster Randomized Controlled Trial Tjarco Koppenaal Martijn F. Pisters Corelien J.J. Kloek Remco M. Arensman Raymond W.J.G. Ostelo Cindy Veenhof Published in Journal of Medical Internet Research 2022;24(2):e31675
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