TI - QUestions and answers PT - JOUR DP - 1959 TA - Journal of the American Medical Association pages = {1042-1044}, VI - 171 IP - 7 AID - 10.1001/jama.1959.03010250180033 [doi] 4100 - http://dx.doi.org/10.1001/jama.1959.03010250180033 SO - Journal of the American Medical Association October 17, 1959 171(7):1042