Brush cytology in the assessment of pancreatico–biliary strictures: a review of 406 cases
C J R Stewart, P R Mills, R Carter, J O'Donohue, G Fullarton, C W Imrie, W R Murray
Journal of Clinical Pathology Jun 2001, 54 (6) 449-455; DOI: 10.1136/jcp.54.6.449