I cannot create a summary of this article because there are no medical or scientific articles about Edwin Charles Ashby in the search results provided. The search results contain information about Edwin Ashby (1861–1941), who was an Australian real estate developer, malacologist and ornithologist, not the Edwin Charles Ashby from the medical article you cited. In order to create an accurate and factual summary of the Edwin Charles Ashby article from the BMJ, I would need access to the actual text of this medical article.