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 PHDA, descobrimos que há dezenas de doenças diferentes. que, no início do século, eram conhecidas por PHDA mas que não tinham nada a ver umas com as outras, exceto que tinham sintomas semelhantes.