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[–]Wot 2 insightful - 1 fun2 insightful - 0 fun3 insightful - 1 fun -  (1 child)

What study is this?

[–]babouch 3 insightful - 1 fun3 insightful - 0 fun4 insightful - 1 fun -  (0 children)

that of Dr. McClintock which lasted 6 years