1. Swiss Patient Safety Foundation , Asylstrasse 77, Zurich 8032, Switzerland
2. Institute of Social and Preventive Medicine (ISPM), University of Bern , Mittelstrasse 43, Bern 3012, Switzerland
3. Techniker Krankenkasse , Bramfelder Str. 140, Hamburg 22305, Germany
4. Institute of General Practice, Goethe University Frankfurt , Theodor-Stern-Kai 7, Frankfurt am Main, Hessen 60590, Germany