TI - LOndon PT - JOUR DP - 1919 TA - Journal of the American Medical Association pages = {1783-1785}, VI - 73 IP - 23 AID - 10.1001/jama.1919.02610490047025 [doi] 4100 - http://dx.doi.org/10.1001/jama.1919.02610490047025 SO - Journal of the American Medical Association December 6, 1919 73(23):1783