Articles Letters, Notes, and Answers Br Med J 1928; 2 doi: https://doi.org/10.1136/bmj.2.3536.682 (Published 13 October 1928) Cite this as: Br Med J 1928;2:682 Article Related content Metrics Responses Peer review Related articles Correction Corrigendum Published: 15 October 1932; Br Med J 2 doi:10.1136/bmj.2.3745.738