Endoscopic ultrasound guided fine needle aspiration biopsy: a large single centre experience
D B Williams, A V Sahai, L Aabakken, I D Penman, A van Velse, J Webb, M Wilson, B J Hoffman, R H Hawes
Gut May 1999, 44 (5) 720-726; DOI: 10.1136/gut.44.5.720