Neither paper indicated which form of leukodystrophy the men have -- there are about 40 known types of the largely genetic brain cell-damaging disorder -- or who diagnosed the brothers .

不管是媒体还是为兄弟俩诊断的人都没有指明他们患的是哪一类型的脑白质病变--可知的关于大脑细胞损伤性病变大约就有40种。