Esser, P http://orcid.org/0000-0002-4944-8020
Kuba, K http://orcid.org/0000-0002-7551-7931
Mehnert, A
Schwinn, A
Schirmer, L
Schulz-Kindermann, F
Kruse, M
Koch, U
Zander, A R
Kröger, N
Schilling, G
Götze, H
Scherwath, A
Article History
Received: 24 August 2016
Revised: 28 October 2016
Accepted: 17 November 2016
First Online: 23 January 2017
Competing interests
: The authors declare no conflict of interest.