NawazH.; FanC.; KlokeJ.; KhalidA.; McGrathK.; LandsittelD.; PapachristouG. Performance Characteristics of Endoscopic Ultrasound in the Staging of Pancreatic Cancer: A Meta-Analysis. JOP. Journal of the Pancreas, v. 14, n. 5, p. 484-497, 10 set. 2013.