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"In observational studies, we often have to rely on assumptions that are not directly testable."
Illness is the night-side of life, a more onerous citizenship. Everyone who is born holds dual citizenship, in the kingdom of the well and in the kingdom of the sick.
人类是一种非常奇特的生物。他认为自己有一个灵魂,但他就是一个灵魂;他有一个身体。