Modern technique is slightly different, but the outsome / goals essentially the same. And this historical record is elighntening both in the origins and the evolution of the clinical treatent. Today, the preferred method is to drug children in schools.
Evolution surely hasn't increased the error rate in replicating "normal" DNA sets over the past 50 years, but the data indicates something like 1/5 of them are now "defective" enough to be eligible for the happy treatment.[1]
How so? What happened to them?