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Socio-economic differences in self-reported insomnia and stress in Finland from 1979 to 2002: a population-based repeated cross-sectional survey

Kirsi M Talala*, Tuija P Martelin, Ari H Haukkala, Tommi T Härkänen and Ritva S Prättälä

BMC Public Health 2012, 12:650  doi:10.1186/1471-2458-12-650

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