Luyten FP,Geusens P,Malaise M,De CL,Westhovens R,Raeman F,Vander MD,Mathy L,Hauzeur JP,De KF,Van den Bosch F. A prospective randomised multicentre study comparing continuous and intermittent treatment with Celecoxib in patients with osteoarthritis of the knee or hip. Ann Rheum Dis 2007;66(1):99-106.