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Central hospital districts included in the study. Abbreviations: CF, Central Finland; ES, Eastern Savo; KH, Kanta-Häme; K, Kymenlaakso; L, Lapland; LP, Länsi-Pohja; NK, North Karelia; NO, Northern Ostrobothnia; NS, Northern Savo; PH, Päijät-Häme; S, Satakunta; SK, South Karelia; SO, South Ostrobothnia; SS, Southern Savo; SW, Southwest Finland; T, Tampere region; U, Uusimaa; V, Vaasa.
