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On the association of cell phone exposure with childhood behaviour
  1. Madhuri Sudan1,
  2. Leeka Kheifets1,
  3. Onyebuchi A Arah1,2,
  4. Jørn Olsen1,3
  1. 1Department of Epidemiology, The Fielding School of Public Health, University of California, Los Angeles, California, USA
  2. 2Department of Public Health, Academic Medical Center, University of Amsterdam, Amsterdam, The Netherlands
  3. 3The Danish Epidemiology Science Centre, Institute of Public Health, University of Aarhus, Aarhus, Denmark
  1. Correspondence to Dr Madhuri Sudan, Department of Epidemiology, UCLA Fielding School of Public Health, 650 Charles E. Young Dr. South, Los Angeles, CA 90095-1772, USA; msudan{at}

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We were pleased to read the paper by Guxens et al,1 which examined the association of prenatal cell phone and cordless phone use with behavioural problems in children. We are encouraged to see new research on this topic, but would like to point out several limitations in that study.

The authors concluded that they did not find an association between prenatal cell phone use and behavioural problems in children, and that their findings differed from associations in the Danish National Birth Cohort (DNBC) as reported by Divan et al.2 ,3 These conclusions overlook Guxens et al's small sample size of 2529 and much smaller number of exposed cases. The …

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