1. Danish Center for Healthcare Improvements, Department of Business and Management, Fibigerstraede 11, DK-9220, Aalborg University, Aalborg, Denmark
2. Center for Research in Econometric Analysis of Time Series, Department of Economics and Business, Aarhus University, Fuglesangs Allé 4, DK-8210 Aarhus V, Denmark
3. The Danish Institute for Quality and Accreditation in Healthcare, Olof Palmes Allé 13, 1.th., DK-8200 Aarhus N, Denmark