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Authors
Liu, T
Li, S-C
Papenberg, G
Schröder, J
Roehr, J T
Nietfeld, W
Lindenberger, U
Bertram, L
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Article History
Received: 28 January 2014
Revised: 1 May 2014
Accepted: 21 May 2014
First Online: 30 September 2014
Competing interests
: The authors declare no conflict of interest.
