RT Journal T1 CUrrent comment JF Journal of the American Medical Association JO Journal of the American Medical Association YR 1919 FD December 13 VO 73 IS 24 SP 1846 OP 1847 DO 10.1001/jama.1919.02610500036017 UL http://dx.doi.org/10.1001/jama.1919.02610500036017 AB