Não informado. (2020). New England Journal of Medicine. Massachusetts Medical Society.
शिकागो शैली (17वां संस्करण) प्रशस्ति पत्रNão informado. New England Journal of Medicine. Waltham, Mass: Massachusetts Medical Society, 2020.
एमएलए (8वां संस्करण) प्रशस्ति पत्रNão informado. New England Journal of Medicine. Massachusetts Medical Society, 2020.
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