Received: 15 May 2017
Revised: 20 June 2017
Accepted: 23 June 2017
First Online: 14 July 2017
Compliance with ethical standards
: The authors state that there are no existing or potential conflicts of interest including financial, consultant, institutional and other relationships that might lead to bias or a conflict of interest. None of the data presented in this study have been published previously. The authors declare that this study has not received any funding. The authors guarantee that the article has been submitted only to Insights into Imaging.