Smoking, respiratory symptoms, and diseases : A comparative study between northern sweden and northern finland : Report from the FinEsS studyLINDSTRÖM, Mai; KOTANIEMI, Jyrki; JÖNSSON, Elsy et al.Chest. 2001, Vol 119, Num 3, pp 852-861, issn 0012-3692Article

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Does non-responder bias have a significant effect on the results in a postal questionnaire study?KOTANIEMI, Jyrki-Tapani; HASSI, Juhani; KATAJA, Matti et al.European journal of epidemiology. 2001, Vol 17, Num 9, pp 809-817, issn 0393-2990Article