Abstract
PROCEEDINGS OF THE SOCIETY OP HYGIENE OF THE SCHOOL OF HYGIENE AND PUBLIC HEALTH OF THE JOHNS HOPKINS UNIVERSITY, OF BALTIMORE, MARYLAND Get access American Journal of Epidemiology, Volume 3, Issue 4, July 1923, Pages 481–485, https://doi.org/10.1093/oxfordjournals.aje.a118949 Published: 01 July 1923
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