An interdisciplinary research group, "the Twincities Research Group", has been initiated at Linköping University. "Twincities" refers to the two equally sized cities Linköping and Norrköping in southeast Sweden.
These two cities, located within a distance of only 40 km, are part of the same county council and consequently have the same health care structure. However, public health in the twincities is remarkably different. This research design enables us to compare public health in two developing cities into the post-industrial age. The comparison has a design similar to the classical experiment with a control and an experiment group, as the social history and the socio-economic structure of the cities are different.