RT Journal Article SR Electronic T1 Pyoderma gangrenosum associated with chronic polyarthritis JF Canadian Medical Association Journal JO CMAJ FD Canadian Medical Association SP 1746 OP 1746 DO 10.1503/cmaj.110679 VO 183 IS 15 A1 Hoff, Norman-Philipp A1 Gerber, Peter Arne YR 2011 UL http://www.cmaj.ca/content/183/15/1746.abstract