TI - LOndon PT - JOUR DP - 1929 TA - Journal of the American Medical Association pages = {219-220}, VI - 93 IP - 3 AID - 10.1001/jama.1929.02710030055021 [doi] 4100 - http://dx.doi.org/10.1001/jama.1929.02710030055021 SO - Journal of the American Medical Association July 20, 1929 93(3):219