RT Journal Article SR Electronic T1 Acute sinusitis complicated with Pott puffy tumour JF Canadian Medical Association Journal JO CMAJ FD Canadian Medical Association SP E165 OP E165 DO 10.1503/cmaj.181025 VO 191 IS 6 A1 Petros Koltsidopoulos A1 Eleni Papageorgiou A1 Charalampos Skoulakis YR 2019 UL http://www.cmaj.ca/content/191/6/E165.abstract