Demographic characteristics of the investigated groups.
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1. Risk factors by self-report;2. Self-reported days since estimated exposure at enrollment [when a range of dates was provided (multiple potential exposures) the mean was used]. For age, chronic cases and controls do not differ, but each differ from mean of acute cases; for education, acute cases and controls do not differ, but each differ from chronic cases;3. Data available on 24/31 cases.
创建时间：
2015-12-02
