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https://scholar.google.com/scholar_lookup?title=Importation%20and%20human-to-human%20transmission%20of%20a%20novel%20coronavirus%20in%20Vietnam&author=LT%20Phan&author=TV%20Nguyen&author=QC%20Luong&publication_year=&journal=N%20Engl%20J%20Med&volume=&pages=