Zeijlemaker, W
Kelder, A
Oussoren-Brockhoff, Y J M
Scholten, W J
Snel, A N
Veldhuizen, D
Cloos, J
Ossenkoppele, G J
Schuurhuis, G J
Article History
Received: 30 June 2015
Revised: 30 August 2015
Accepted: 4 September 2015
First Online: 16 September 2015
Competing interests
: The authors declare no conflict of interest.