Letters Mobile phones and brain tumours

Authors’ reply to Khurana and to Philips and Lamburn

BMJ 2011; 343 doi: https://doi.org/10.1136/bmj.d7912 (Published 06 December 2011) Cite this as: BMJ 2011;343:d7912
  1. Patrizia Frei, postdoctoral research fellow1,
  2. Aslak H Poulsen, doctoral student1,
  3. Christoffer Johansen, professor1,
  4. Jørgen H Olsen, director1,
  5. Marianne Steding-Jessen, statistician1,
  6. Joachim Schüz, head of section2
  1. 1Institute of Cancer Epidemiology, Danish Cancer Society, Strandboulevarden 49, 2100 Copenhagen, Denmark
  2. 2International Agency for Research on Cancer (IARC), Section of Environment and Radiation, 150 Cours Albert Thomas, 69372 Lyon CEDEX 08, France
  1. frei{at}cancer.dk

Khurana asks about the number of brain tumour cases in the cohort, exposure assessment, and cohort ascertainment.1

Brain tumour cases—The 10-fold increase among long term subscribers since the previous update is a mixture of the ageing of the cohort and a major increase in person years under risk in subscribers of 10 or more years (1.2 million compared with 170 000 person years2) who were in the 5-9 years category of …

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