Biering-Sørensen, Fin
Kennelly, Michael
Kessler, Thomas M.
Linsenmeyer, Todd
Pannek, Jürgen
Vogel, Lawrence
Wyndaele, Jean-Jacques
Article History
Received: 16 April 2018
Revised: 3 June 2018
Accepted: 4 June 2018
First Online: 6 July 2018
Compliance with ethical standards
:
: The authors declare that they have no conflict of interest.