1. Dieter Scheffner Center for Medical Education and Educational Research, Free and Humboldt University of Berlin, Berlin, Germany;
2. Department of Medicine, University of California San Francisco, San Francisco, CA, USA;
3. Center for Research and Development of Education, University Medical Center Utrecht, Utrecht, The Netherlands;
4. Department of Pediatrics, University of California San Francisco, San Francisco, CA, USA;
5. Department of Pediatrics, Georgetown University School of Medicine, Washington, DC, USA