Cueto, H T
Riis, A H
Hatch, E E
Wise, L A
Rothman, K J
Sørensen, H T
Mikkelsen, E M
Article History
Received: 20 August 2014
Revised: 10 April 2015
Accepted: 14 May 2015
First Online: 17 June 2015
Competing interests
: The authors declare no conflict of interest.