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Opinel, Annick; Tröhler, Ulrich; Gluud, Christian; Gachelin, Gabriel; Smith, George Davey; Podolsky, Scott Harris; Chalmers, Iain (2013). Commentary: The evolution of methods to assess the effects of treatments, illustrated by the development of treatments for diphtheria, 1825-1918. International journal of epidemiology, 42(3), pp. 662-676. Oxford: Oxford University Press 10.1093/ije/dyr162
