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However, none of the studies can
answer questions about longterm
exposures, since the average period
of phone use in these studies was
around three years.
5.Whatresearchisneededto
decidewhetherRFexposure
fromwirelessphonesposesa
healthrisk?
A combination of laboratory studies
and epidemiological studies of
people actually using wireless
phones would provide some of
the data that are needed. Lifetime
animal exposure studies could be
completed in a few years. However,
very large numbers of animals
would be needed to provide reliable
proof of a cancer promoting effect if
one exists. Epidemiological studies
can provide data that is directly
applicable to human populations, but
10 or more years follow-up may be
needed to provide answers about
some health effects, such as cancer.
This is because the interval between
the time of exposure to a cancer-
causing agent and the time tumors
develop - if they do may be many,
many years. The interpretation of
epidemiological studies is hampered
by difficulties in measuring actual RF
exposure during day-to-day use of
wireless phones. Many factors affect
this measurement, such as the angle
at which the phone is held, or which
model of phone is used.
6.WhatistheFDAdoingtofind
outmoreaboutthepossible
healtheffectsofwireless
phoneRF?
The FDA is working with the U.S.
National Toxicology Program and
with groups of investigators around
the world to ensure that high priority
animal studies are conducted
to address important questions
about the effects of exposure to
radiofrequency energy (RF). The FDA
has been a leading participant in the