相关性应是合理的；也就是说，根据疾病的自然史和生物学上的已知事实，可以从生物学角度来解释相关性。
The association should be coherent; that is, plausible and explicable biologically according to known facts in the natural history and biology of the disease.
结果，那些医生发现我的慢性病既肮脏又令人惧怕。 他们受训考虑有着自然史和精确的后果的“真实”疾病实体。
The upshot is that practitioners, trained to think of "real" disease entities, with natural histories and precise outcomes, find my chronic illness both messy and threatening.
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