RT Journal T1 AUstria JF Journal of the American Medical Association JO Journal of the American Medical Association YR 1959 FD April 11 VO 169 IS 15 SP 1784 OP 1784 DO 10.1001/jama.1959.73000320012021 UL http://dx.doi.org/10.1001/jama.1959.73000320012021 AB