1 Center for Health Economics Research Hannover (CHERH), Leibniz Universität Hannover, Otto-Brenner-Straße 1, 30159, Hanover, Germany. ak@ivbl.uni-hannover.de.
2 Center for Health Economics Research Hannover (CHERH), Leibniz Universität Hannover, Otto-Brenner-Straße 1, 30159, Hanover, Germany.