Demographics, co-morbidities, and history of travel.
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*2-sided p-value by Student's t test.†2-sided p-value by chi-squared test or Fisher's exact test‡Includes diabetes, asthma (excluding childhood asthma), COPD (chronic obstructive pulmonary disease), chronic bronchitis, cardiovascular disease (excluding hypertension) and conditions possibly causing an immuno-compromised state
创建时间：
2015-12-02
