TI - GOvernment services PT - JOUR DP - 1939 TA - Journal of the American Medical Association pages = {1271}, VI - 112 IP - 13 AID - 10.1001/jama.1939.02800130055019 [doi] 4100 - http://dx.doi.org/10.1001/jama.1939.02800130055019 SO - Journal of the American Medical Association April 1, 1939 112(13):1271