Corresponding author: Markus Pecina, MD, PhD, Department of Orthopaedic Surgery, University of Zagreb, School of Medicine, 10000 Zagreb, Salata 7 Croatia, marko.pecina@zg.hinet.hr
Corresponding author: Mitsuo Kinoshita, MD, Department of Orthopedic Surgery, Osaka Medical College, 2-7 Daigaku-machi Takatsuki City, Osaka 569-8686 Japan, mitsuok@poh.osaka-med.ac.jp