1 Department of Orthopaedics, Nara Medical University, Nara, Japan. shinji104@mail.goo.ne.jp.
2 First Department of Orthopaedics, National and Kapodistrian University of Athens, School of Medicine, 41 Ventouri Str, 15562, Athens, Greece. afm@otenet.gr.
3 Department of Orthopaedics, San Gerardo Hospital, Monza, Italy.
4 Department of Pathology, Istituto Ortopedico Rizzoli, Bologna, Italy.
5 Department of Public Health, Health Management, and Policy, Nara Medical University, Nara, Japan.
6 Department of Orthopaedic Oncology, Istituto Ortopedico Rizzoli, Bologna, Italy.
7 Department of Orthopaedics, Nara Medical University, Nara, Japan.
8 Department of Orthopaedic Oncology, Istituto Ortopedico Rizzoli, Bologna, Italy. costantino.errani@ior.it.
Last and second name of an author have been mixed up. It shows Piergiuseppe as the last name, but his second name is Tanzi and the first name is Piergiuseppe.