1. Otto von Guericke University Magdeburg, Faculty of Medicine, Institute of Social Medicine and Health Systems Research, Magdeburg, Saxony-Anhalt, Germany
2. University of Regensburg, Faculty of Medicine, Medical Sociology, Regensburg, Bavaria, Germany
3. University of Regensburg, University Children’s Hospital Regensburg (KUNO-Clinics), Regensburg, Bavaria, Germany
4. University Hospital Magdeburg, Magdeburg, Saxony-Anhalt, Germany