Text and Data Mining valid from 2018-04-10
Received: 7 September 2017
Accepted: 28 March 2018
First Online: 10 April 2018
Change Date: 1 June 2018
Change Type: Correction
Change Details: Following the publication of this article , the authors noticed that Figs. 2, 3 and 4 were in the incorrect order and thus had incorrect captions.
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