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Collaborators K Ahmadi, A von Alt Stutterheim, E Barth, H Bisinger, P Bremer, S El-Nawab-Becker, A Gödde, H Heintz, M Janneck, S Kahl, M Kern, B Panzer, C Platzek, L Roth, M Schaposchnikow, A Schiewek-Güsmer, U Schnoor, S Tatzis, H Tremel, B. Varoga, J. Veigel, W. Winter, J Wollenhaupt.
Contributors Both authors contributed equally in collecting and analysing the data as well as in writing the manuscript.
Funding The authors have not declared a specific grant for this research from any funding agency in the public, commercial or not-for-profit sectors.
Competing interests None declared.
Patient and public involvement Patients and/or the public were not involved in the design, or conduct, or reporting, or dissemination plans of this research.
Provenance and peer review Not commissioned; internally peer reviewed.