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Contributors Study design: AP, PO and KD. Data collection: AP, KD and CJ. Image interpretation: AP, KD and JB. Statistical analysis: AP and JB. Manuscript writing: AP and GW. Manuscript editing: PO and GW.
Funding The project received a grant from Bayer Vital GmbH in December 2013.
Competing interests None.
Patient consent Obtained.
Ethics approval Ethics Committee of Friedrich-Schiller-University Jena.
Provenance and peer review Not commissioned; externally peer reviewed.
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