Rose Chen - Common causes for a persistent cough (Part 1)

Persistent coughing has many possible causes Source: Flickr - Todd Van Hoosear (CC BY-SA 2.0)
It seems that during winter time, more people start to cough. According to Rose Chen, a Chinese medicine practitioner based in Sydney, it may be due to the dry weather during winter time. What are other possible causes that may lead to persistent cough? Please listen to Rose's explanation.
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