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Birth order may play a role in autoimmune diseases and early childhood infections, both factors implicated in the etiology of narcolepsy. We investigated the association between birth order and narcolepsy risk in a population-based case–control study in which all study subjects were HLA-DQB1*0602 positive.Subjects were 18–50years old, residents of King County, Washington, and positive for HLA-DQB1*0602...
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