TI - CUrrent comment PT - JOUR DP - 1939 TA - Journal of the American Medical Association pages = {2520}, VI - 112 IP - 24 AID - 10.1001/jama.1939.02800240036015 [doi] 4100 - http://dx.doi.org/10.1001/jama.1939.02800240036015 SO - Journal of the American Medical Association June 17, 1939 112(24):2520