EUS-guided tissue sampling: comparison of ”dual sampling” (Trucut biopsy plus FNA) with ”sequential sampling” (Trucut biopsy and then FNA as required) - Aithal, G P; Anagnostopoulos, G K; Tam, W; Dean, J; Zaitoun, A; Kocjan, G; Ragunath, K; Pereira, S P (Endoscopy, 2007)