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https://scholar.google.com/scholar_lookup?title=early%20transmission%20dynamics%20in%20Wuhan%2C%20China%2C%20of%20novel%20coronavirus-infected%20pneumonia.&author=Q%20Li&author=X%20Guan&author=P%20Wu&publication_year=2020&journal=N%20Engl%20J%20Med&volume=&pages=