不管从生物学还是从症候方面都无法区分这些不同类型的病症，于是我们看到了一个连续统 — — 最有可能是复杂性而不是严重性的连续统。
It has proved to be impossible to distinguish, either biologically or symptomatically, between different varieties of these conditions, which thus constitute a continuum – most likely of complexity, rather than severity.