RT Journal Article SR Electronic T1 Porphyria JF Postgraduate Medical Journal JO Postgrad Med J FD The Fellowship of Postgraduate Medicine SP 186 OP 190 DO 10.1136/pgmj.32.366.186 VO 32 IS 366 A1 Gray, Charles YR 1956 UL http://pmj.bmj.com/content/32/366/186.abstract AB