1. Induced abortions were sought in the hospital register only when the respondents reported at least one pregnancy after 1972, but they were sought among all non-respondents. Therefore the induced abortions were not included in the analysis of non-response bias
2. Whether the association found between factory Heidam LZ. Fetotoxicity and chemicals in the occupational environment: a literature review. University of Odense, 1978: 157. (In Danish.) 'Tomlin PJ. Health problems of anaesthetists and their families in the West Midlands;Br MedJ,1979
3. Exposure to anaesthetic gases and spontaneous abortions: response bias in a postal questionnaire study;Axelsson, G.; Rylander, R.;Int J Epidemiol,1982
4. Central-nervous-system defects in children born to mothers exposed to organic solvents during pregnancy;Holmberg, P.C.;Lancet,1979
5. Teratogenic effects of organic solvents;Sheik, H.K.;Lancet,1979