LG Optimus L9 P769 User Manual page 157

absence of RF exposure. Other
studies exposed the animals to
RF for up to 22 hours per day.
These conditions are not similar
to the conditions under which
people use wireless phones, so
we do not know with certainty
what the results of such studies
mean for human health. Three
large epidemiology studies have
been published since December
2000. Between them, the
studies investigated any possible
association between the use of
wireless phones and primary brain
cancer, glioma, meningioma,
or acoustic neuroma, tumors
of the brain or salivary gland,
leukemia, or other cancers. None
of the studies demonstrated the
existence of any harmful health
effects from wireless phone RF
exposures. However, none of the
studies can answer questions
about long-term exposures, since
the average period of phone use
in these studies was around three
years.
5. What research is needed
to decide whether RF
exposure from wireless
phones poses a health
risk?
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 ten 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
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