TI - MEdical economic abstracts PT - JOUR DP - 1939 TA - Journal of the American Medical Association pages = {1606}, VI - 112 IP - 16 AID - 10.1001/jama.1939.02800160070021 [doi] 4100 - http://dx.doi.org/10.1001/jama.1939.02800160070021 SO - Journal of the American Medical Association April 22, 1939 112(16):1606