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URL：https://www.nejm.org/na101/home/literatum/publisher/mms/journals/content/nejm/1990/nejm_1990.323.issue-25/nejm199012203232508/production/images/img_medium/nejm199012203232508_f3.jpeg 掲載元：https://www.nejm.org/doi/full/10.1056/NEJM199012203232508
