RT Journal Article SR Electronic T1 Acute rhinosinusitis and systemic corticosteroids JF Canadian Medical Association Journal JO CMAJ FD Canadian Medical Association SP 62 OP 62 DO 10.1503/cmaj.113-2093 VO 185 IS 1 A1 Roderick P. Venekamp YR 2013 UL http://www.cmaj.ca/content/185/1/62.2.abstract