Flaquer, A
Baumbach, C
Ladwig, K-H
Kriebel, J
Waldenberger, M
Grallert, H
Baumert, J
Meitinger, T
Kruse, J
Peters, A
Emeny, R
Strauch, K
Article History
Received: 24 September 2014
Revised: 9 January 2015
Accepted: 12 January 2015
First Online: 10 March 2015
Competing interests
: The authors declare no conflict of interest.