The need for exposure grouping strategies in studies of magnetic fields and childhood leukemia comment

Exposure

• • magnetic field
• • power transmission line
• • occupational
  • residential

Commented articles

• Neutra RR et al. (1996): When "wire codes" predict cancer better than spot measurements of magnetic fields
• Feychting M et al. (1996): Estimating exposure in studies of residential magnetic fields and cancer: importance of short-term variability, time interval between diagnosis and measurement, and distance to power line