- Correspondence to Dr Florian Alten, Department of Ophthalmology, University of Muenster Medical Centre, Domagkstrasse 15, 48149 Muenster, Germany;
- Received 2 April 2014
- Revised 11 August 2014
- Accepted 28 August 2014
- Published in print 1 June 2015.
- Published online 20 May 2015.
- Published first 17 September 2014.
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