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. 1902;21:101–120.

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Copyright © 1902 Royal Society of Medicine. All rights reserved.

This article version is made available under the CC-BY-NC-ND 4.0 license http://creativecommons.org/licenses/by-nc-nd/4.0/. Please direct permissions requests not covered by this license to SAGE Publishing (https://uk.sagepub.com/en-gb/eur/journals-permissions).

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