Kowalski ML, Lewandowska-Polak A, Woźniak J, Ptasińska A, Jankowski A, Wagrowska-Danilewicz M, Danilewicz M, Pawliczak R. Association of stem cell factor expression in nasal polyp epithelial cells with aspirin sensitivity and asthma. Allergy. 2005 May;60(5):631–7. doi: 10.1111/j.1398-9995.2005.00753.x. PMID: 15813808.