Di Leonardo, Bruno
Ludwig, Björn
Lisson, Jörg Alexander
Contardo, Luca
Mura, Rossano
Hourfar, Jan
Article History
Received: 28 June 2017
Accepted: 15 January 2018
First Online: 20 February 2018
Compliance with ethical guidelines
:
: B. Di Leonardo, B. Ludwig, J.A. Lisson, L. Contardo, R. Mura and J. Hourfar declare that they have no competing interests.
: Ethical approval for this retrospective study was obtained from the institutional review board. For this type of study formal consent is not required.