TI - BErlin PT - JOUR DP - 1929 TA - Journal of the American Medical Association pages = {1980-1981}, VI - 92 IP - 23 AID - 10.1001/jama.1929.02700490080022 [doi] 4100 - http://dx.doi.org/10.1001/jama.1929.02700490080022 SO - Journal of the American Medical Association June 8, 1929 92(23):1980