[1] UNIV PENN HOSP,DEPT MED,GASTROINTESTINAL SECT,PHILADELPHIA,PA
[2] UNIV PENN HOSP,DEPT RADIOL,PHILADELPHIA,PA
[3] PHILADELPHIA GEN HOSP,UNIV PENN DIV,DEPT MED,PHILADELPHIA,PA
[4] PHILADELPHIA GEN HOSP,UNIV PENN DIV,DEPT RADIOL,PHILADELPHIA,PA
[5] VET ADM HOSP,UNIV PENN DIV,DEPT MED,PHILADELPHIA,PA
[6] VET ADM HOSP,UNIV PENN DIV,DEPT RADIOL,PHILADELPHIA,PA
[7] UNIV PENN,SCH MED,PHILADELPHIA,PA