Evaluation of the efficiency of an ultrasound-supported infiltration technique in patients with tennis elbow applying the ITEC medical device: a multicenter study oleh Kathi Thiele, MD, Annemarie Unmann, MD, Stephanie Geyer, MD, Sebastian Siebenlist, MD, Markus Scheibel, MD, Ricarda Seemann, MD, Markus Lerchbaumer, MD, Christian Schoch, MD, Konrad Mader, MD