1) smoking; pVX the disease, the most comprehensive disease database, the latest health information platform, worried about the health of your friends!
(2) of respiratory tract infections; pVX the disease, the most comprehensive disease database, the latest health information platform, worried about the health of your friends!
(3) allergic factors; pVX the disease, the most comprehensive disease database, the latest health information platform, worried about the health of your friends!
(4) other factors such as climate change, and so on
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