TY - JOUR AU - Layfield, L J; Ehya, H; Filie, A C TI - Utilization of ancillary studies in the cytologic diagnosis of biliary and pancreatic lesions: The Papanicolaou Society of Cytopathology Guidelines JO - Cytojournal VL - 11 PY - 2014 DO - 10.4103/1742-6413.127215 L3 - PubMed-ID: 24738005 SP - 4 N1 - et al. ER -