Ultrasonography as a tool for diagnosis, guidance of local steroid injection and, together with pressure algometry, monitoring of the treatment of athletes with chronic jumper's knee and Achilles tendinitis: a randomized, double-blind, placebo-controlled study - Fredberg, U; Bolvig, L; Pfeiffer-Jensen, M; Clemmensen, D; Jakobsen, B W; Stengaard-Pedersen, K (Scand J Rheumatol, 2004)