So for example, in the case of ADHD, we discovered that there are dozens of different diseases, all of which had been called ADHD at the start of the century, that actually had nothing to do with each other, except that they had similar symptoms.
Por exemplo, no caso do TDAH, descobrimos que existiam dezenas de diferentes doenças que eram chamadas de TDAH no começo do século e não tinham nada a ver uma com a outra, a não ser sintomas semelhantes.