Surely they made a difference? Health visitors and infant mortality in the 1900s.
Drake
Michael
M
D003152:Community Health Nursing / Q000266:history*; D049672:History, 19th Century; D049673:History, 20th Century; D006801:Humans; D007223:Infant; D007226:Infant Mortality / Q000266:history*; D007231:Infant, Newborn; D009026:Mortality / Q000639:trends; D006113:United Kingdom / Q000453:epidemiology