Wolff, M
Rogers, K
Erdal, B
Chalmers, J P
Sundquist, K
Midlöv, P
Article History
Received: 27 July 2015
Revised: 4 November 2015
Accepted: 23 November 2015
First Online: 21 January 2016
Competing interests
: The authors declare no conflict of interest.