Nguyen-Hoai, T
Pham-Duc, M
Gries, M
Dörken, B
Pezzutto, A
Westermann, J
Article History
Received: 15 January 2016
Revised: 26 February 2016
Accepted: 1 March 2016
First Online: 8 April 2016
Competing interests
: The authors declare no conflict of interest.