[1] Helmholtz Zentrum Munchen, Inst Hlth Econ & Hlth Care Management, Ingolstadter Landstr 1, D-85764 Neuherberg, DE, Germany
[2] Univ Southern Denmark, Dept Polit Sci & Publ Management, Campusvej 55, DK-5230 Odense, DK, Denmark
[3] Univ Hamburg, Hamburg Ctr Hlth Econ, Esplanade 36, D-20354 Hamburg, DE, Germany
[4] Digmed Datenmanagement Gesundheitswesen GmbH, Flachsland 23, D-22083 Hamburg, DE, Germany