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Public health versus population density.

In earlier studies on the incidence of malignant melanoma in Sweden, Norway, Denmark, and the USA, an association was found in Sweden between the incidence of malignant melanoma and the number of FM-broadcasting transmitters covering an area (Hallberg and Johansson, 2002, 2005). It was also noticed that the density of area-covering transmitters was significantly correlated with the population density.