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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. What is the FDA doing to find
out more about the possible
health effects of wireless phone
RF?
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 World
Health Organization International
Electromagnetic Fields (EMF)
Project since its inception in
1996. An influential result of this
work has been the development
of a detailed agenda of research
needs that has driven the
establishment of new research
programs around the world. The
project has also helped develop a
series of public information
documents on EMF issues. The
FDA and the Cellular
Telecommunications & Internet
Association (CTIA) have a formal
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