1. Department of General Practice and Primary Care, University Medical Centre Hamburg-Eppendorf , Martinistraße 52, 20246 Hamburg , Germany
2. Department of Health Economics and Health Care Research, University Medical Centre Hamburg-Eppendorf , Martinistraße 52, 20246 Hamburg , Germany
3. Institute for General Practice and Palliative Care, Hannover Medical School , Carl-Neuberg-Straße 1, 30625 Hannover , Germany
4. Department of Medical Statistics, University Medical Centre Göttingen , Humboldtallee 32, 37073 Göttingen , Germany
5. Division of General Practice, Carl von Ossietzky University of Oldenburg , Ammerlaender Heerstraße 114-118, 26129 Oldenburg , Germany
6. Department of General Practice, University Medical Centre Göttingen , Humboldtallee 38, 37073 Göttingen , Germany
7. Department of Palliative Medicine, University Medical Centre Göttingen, Von-Siebold-Str. 3, 37075 Göttingen and Institute for General Practice and Palliative Care, Hannover Medical School , Carl-Neuberg-Str. 1, 30625 Hannover , Germany
8. Department of Palliative Medicine, University Medical Centre Göttingen , Von-Siebold-Str. 3, 37075 Göttingen , Germany