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. 1892 Apr;37(10):966–969.

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Periscope of Public Health

Harvey Littlejohn

Harvey Littlejohn, M.B., etc.

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This article is distributed under the terms of the Creative Commons Attribution-NonCommercial 4.0 International License, which permits non-commercial use and redistribution provided that the original author and source are credited.

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PMCID: PMC5280490

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