RT Journal T1 SWeden JF Journal of the American Medical Association JO Journal of the American Medical Association YR 1955 FD October 22 VO 159 IS 8 SP 805 OP 806 DO 10.1001/jama.1955.02960250067020d UL http://dx.doi.org/10.1001/jama.1955.02960250067020d AB