It distinguishes between basic functions, i.e. frequent low complexity treatments, which do not require centralisation, and special functions, which are to be provided by a limited number of hospitals, depending on their complexity. This is in line with international evidence showing that efficiency thresholds tend to increase with the complexity of the treatment. For emergency wards, a population base of 200 000 to 400 000 is recommended, implying a reduction from about 40 currently to 20-25 (Andersen and Jensen, 2010).