Picelli, A.; Bonetti, P.; Fontana, C.; Barausse, M.; Dambruoso, F.; Gajofatto, F.; Tamburin, S.; Girardi, P.; Gimigliano, R.; Smania, N. Accuracy of Botulinum Toxin Type A Injection into the Gastrocnemius Muscle of Adults With Spastic Equinus: Manual Needle Placement and Electrical Stimulation Guidance Compared Using Ultrasonography. JRM 2012, 44, 450-452.