Emmrich, S
Engeland, F
El-Khatib, M
Henke, K
Obulkasim, A
Schöning, J
Katsman-Kuipers, J E
Michel Zwaan, C
Pich, A
Stary, J
Baruchel, A
de Haas, V
Reinhardt, D
Fornerod, M
van den Heuvel-Eibrink, M M
Klusmann, J H
Article History
Received: 5 December 2014
Revised: 21 May 2015
Accepted: 22 May 2015
First Online: 13 July 2015
Competing interests
: The authors declare no conflict of interest.