Almost all projects of this kind fall apart within a decade because too many people drop out of the study, or funding for the research dries up, or the researchers get distracted, or they die, and nobody moves the ball further down the field.
Næsten alle projekter af den type falder fra hinanden inden 10 år fordi alt for mange mennesker  dropper ud af undersøgelsen, eller finansieringen stopper, eller forskerne bliver distraheret, eller de dør, og ingen  giver bolden videre.