Engebretsen K, Grotle M, Bautz-Holter E, et al.
"Radial extracorporeal shockwave treatment compared with supervised exercises in patients with subacromial pain syndrome: a single blind randomised study"
Brit Med J 2009; 339:b3360
Comparison of the recovery of patients suffering from shoulder pain with two different methods: extracorporeal shock wave therapy and supervised exercises.
Full Study: http://www.bmj.com/content/339/bmj.b3360