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Kui-yi
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In
the
mid-sixties, there occurred among North
Americans
who
were heavy
beer
drinkers
a
rare type
of
cardiac-vascular
disease. One
of
the
characteristics
of
the
disease
is
the
sudden
increase
in
the
production
of
red-blood
cells.
The death
rate
among
this
group
of
people
approximates
40%.
lnstantly
this
became
a
major
concern for scientists and doctors.
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