Inter and intea-observer variation in ultrasonographic detection of gallstones: The Multicenter Italian Study on Epidemiology of Cholelithiasis (M.I.COL.) - Festi, D.; Lalloni, L.; Taroni, F.; Barbara, L.; Menotti, A.; Ricci, G. (Springer, 1989)
http://dx.doi.org/10.1007/BF00145045
Keywords: WW-YZ