1. Martin Luther University Halle-Wittenberg; Institute for Health and Nursing Science, German Center for Evidence-based Nursing; Magdeburger Strasse 8 Halle/Saale Germany 06097
2. German Center for Evidence-based Nursing, Martin Luther University Halle-Wittenberg; Institute for Health and Nursing Science; Magdeburger Strasse 8 Halle/Saale Germany 06097
3. University Hospital Regensburg; Klinik und Poliklinik für Kinder- und Jugendmedizin; Franz-Josef-Strauss-Allee 11 Regensburg Germany 93042
4. Martin Luther University Halle-Wittenberg; Institute of Medical Epidemiology, Biostatistics and Informatics; Magdeburger Str. 8 Halle (Saale) Germany 06112