Sirkka-Liisa KiveläUnit of Family Medicine, Turku University Hospital and Satakunta Central Hospital, Lemminkäisenkatu 1, 20014 University of Turku, Finland.
Erja RappeDepartment of Applied Biology, PO Box 27, C-House, 00014 University of Helsinki, Finland
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Sirkka-Liisa Kivelä
Sirkka-Liisa KiveläUnit of Family Medicine, Turku University Hospital and Satakunta Central Hospital, Lemminkäisenkatu 1, 20014 University of Turku, Finland.
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Hannu Rita
Hannu RitaDepartment of Forest Resource Management, Statistics and Methodology, PO Box 27, 00014 University of Helsinki, Finland.
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