Lieberman study today

Looking at the Lieberman study, consider that it was published in 2002, so is roughly 15 years old at this point. Moreover, the data cohort was from 1973-1995, so 20-40 years old. Do the findings still hold merit? Are there arguments available that perhaps this study has aged past its usefulness, and newer information is available? Or has little changed and the concepts Liebman brought forth still valid?

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