1 Department of Orthopaedic Surgery and Traumatology, Clinical Center Vojvodina, Medical Faculty, University of Novi Sad, Hajduk Veljkova 1, 21 000 Novi Sad, Serbia. [email protected]. [email protected].
2 UPMC Department of Physical Medicine & Rehabilitation, University of Pittsburgh, Kaufmann Building, Suite 201, 3471 Fifth Avenue, Pittsburgh, PA 15213. [email protected].