RT Journal Article SR Electronic T1 Discussion to the paper by J. S. S. Stewart JF Postgraduate Medical Journal JO Postgrad Med J FD The Fellowship of Postgraduate Medicine SP 522 OP 522 DO 10.1136/pgmj.45.526.522 VO 45 IS 526 YR 1969 UL http://pmj.bmj.com/content/45/526/522.abstract AB