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mobile-phones × 85radiation × 16
medical-science × 9
technology × 9
physics × 7
electromagnetism × 7
consumer-products × 6
environmental-health × 5
cancer × 5
road-vehicles × 4
safety × 4
electronics × 4
security × 3
fertility × 3
united-states × 2
sleep × 2
aviation × 2
marketing × 2
videogames × 2
microwaves × 2
causality × 2
radio × 2
driving × 2
bees × 2
history × 1
