TI - QUestions and answers PT - JOUR DP - 1959 TA - Journal of the American Medical Association pages = {2152-2156}, VI - 171 IP - 15 AID - 10.1001/jama.1959.03010330114032 [doi] 4100 - http://dx.doi.org/10.1001/jama.1959.03010330114032 SO - Journal of the American Medical Association December 12, 1959 171(15):2152