Rutjes, Anne W.S.; Jüni, Peter; Da Costa, Bruno R.; Trelle, Sven; Nüesch, Eveline; Reichenbach, Stephan (2012). “Viscosupplementation for Osteoarthritis of the Knee”. Annals of Internal Medicine157 (3): 180–91. doi:10.7326/0003-4819-157-3-201208070-00473. PMID22868835.
Rutjes, Anne W.S.; Jüni, Peter; Da Costa, Bruno R.; Trelle, Sven; Nüesch, Eveline; Reichenbach, Stephan (2012). “Viscosupplementation for Osteoarthritis of the Knee”. Annals of Internal Medicine157 (3): 180–91. doi:10.7326/0003-4819-157-3-201208070-00473. PMID22868835.