Steffensen, Annette Buur
Refaat, Marwan M.
David, Jens-Peter
Mujezinovic, Amer
Calloe, Kirstine
Wojciak, Julianne
Nussbaum, Robert L.
Scheinman, Melvin M.
Schmitt, Nicole
Article History
Received: 5 January 2015
Accepted: 23 March 2015
First Online: 12 June 2015
Competing interests
: The authors declare no competing financial interests.