RT Journal Article SR Electronic T1 Exacerbation of psoriasis with β-blocker therapy JF Canadian Medical Association Journal JO CMAJ FD Canadian Medical Association SP 60 OP 60 DO 10.1503/cmaj.081433 VO 181 IS 1-2 A1 Salman Waqar A1 Pradip K Sarkar YR 2009 UL http://www.cmaj.ca/content/181/1-2/60.abstract