page 31,
There are two extreme positions to explain lifetime variability: heterogeneity hypothesis and stochastic hypothesis.
page 37
GG91 argued that stochastic variation should be considered in addition to environment and genetic factors. GG91 cited Sacher 1977 who tried to quantify stochastic variation from lifespan distribution.
GG91 viewed stochastic variation as 'kinetic' variation.
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