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The study of Yadav et al (2008) in which increased numbers of micronuclei among mobile phone users were found should be replicated. In the present study a higher number of participants (n=131) was examined and a double amount of cells (2000 cells/individual) was counted to increase the statisticalpower. Furthermore a different, DNA-specific staining procedure was applied. Each participant filled out a questionnaire about mobile phone use including duration of weekly use, overall period of use and headset usage for exposure assessment. The participants were divided into eleven groups: no use of mobile phones, 0-3 h/week, >3-6 h/week, >6-9 h/week, >9-12 h/week, and >12-15 h/week; <5 years, 5-10 years and >10 years period of mobile phone use; use and non-use of headsets. Cells of four patients after four weeks of radiotherapy served as positive controls for the micronucleus test.