[1] METHODIST HOSP INDIANA, DEPT RADIOL, GASTROINTESTINAL RADIOL SECT, INDIANAPOLIS, IN 46206 USA
[2] CRAWFORD W LONG MEM HOSP, CTR BILIARY LITHOTRIPSY, ATLANTA, GA USA
[3] EMORY UNIV, SCH MED, DEPT RADIOL, ATLANTA, GA 30322 USA
[4] HOSP UNIV PENN, DEPT RADIOL, GASTROINTESTINAL RADIOL SECT, PHILADELPHIA, PA 19104 USA
[5] HOSP UNIV PENN, DEPT RADIOL, BILIARY LITHOTRIPSY SECT, PHILADELPHIA, PA 19104 USA