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https://scholar.google.com/scholar_lookup?title=A%20familial%20cluster%20of%20pneumonia%20associated%20with%20the%202019%20novel%20coronavirus%20indicating%20person-to-person%20transmission%3A%20a%20study%20of%20a%20family%20cluster&author=JF-W%20Chan&author=S%20Yuan&author=K-H%20Kok&publication_year=2020&journal=Lancet&volume=&pages=