[Cellular telephones and their relay stations: a health risk?].

Portable cellular phones and their relay stations emit ultra-high frequency waves (microwaves) with amplitude modulation and extremely low frequency pulsation. The user is absorbed by the head and reaches the nervous structures leading to increased brain temperature. The general population is exposed to a distant field with an electromagnetic intensity which depends on the distance from the emitting antennas, the presence of "passive re-emitters", and the number of communications processed by the relay station. Among the main biological effects, "radio-frequency disease", electroencephalogram disturbances, and blood pressure disorders as well as risk of cancer have been observed in humans and animals.