This paper is in the following e-collection/theme issue:

Web-based and Mobile Health Interventions 

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Works citing "Effectiveness of a Web-Based Physical Activity Intervention in Patients With Knee and/or Hip Osteoarthritis: Randomized Controlled Trial"

Daniël Bossen, Cindy Veenhof, Karin EC Van Beek, Peter MM Spreeuwenberg, Joost Dekker, Dinny H De Bakker
J Med Internet Res 2013 (Nov 22); 15(11):e257 

According to Crossref, the following articles are citing this article (DOI 10.2196/jmir.2662):

(note that this is only a small subset of citations)

1. Mordarski S. Pain Management in the Elderly: Transdermal Fentanyl for the Treatment of Pain Caused by Osteoarthritis of the Knee and Hip. BioMed Research International 2014;2014:1 [CrossRef]