Characteristics of the participants at baseline and follow-up.
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SD denotes standard deviation.*Exchange rate: US$ 1 = ¥90.†Underlying diseases included chronic respiratory diseases, chronic metabolic diseases, chronic heart diseases, liver diseases, kidney diseases, and immunodeficiency diseases.‡High-risk groups included people with an underlying disease, pregnant women, children age five years or younger, and elderly people aged 65 years or older.§School-going children included primary school students to university students.
创建时间：
2015-12-02
