TI - CUrrent comment PT - JOUR DP - 1939 TA - Journal of the American Medical Association pages = {846}, VI - 112 IP - 9 AID - 10.1001/jama.1939.02800090056016 [doi] 4100 - http://dx.doi.org/10.1001/jama.1939.02800090056016 SO - Journal of the American Medical Association March 4, 1939 112(9):846