P. J. Hammar

Effectiveness of ERCP in cholangitis: a community-based study.

A. Chak, G. Cooper, G. Rosenthal, 2000, Gastrointestinal endoscopy.

Early endoscopy in upper gastrointestinal hemorrhage: associations with recurrent bleeding, surgery, and length of hospital stay.

A. Chak, G. Cooper, G. Rosenthal, 1999, Gastrointestinal endoscopy.

Endoscopic practice for upper gastrointestinal hemorrhage: differences between major teaching and community-based hospitals.

A. Chak, G. Cooper, G. Rosenthal, 1998, Gastrointestinal endoscopy.

Using hospital performance data in quality improvement: the Cleveland Health Quality Choice experience.

D L Harper, G. Rosenthal, D. Harper, 1998, The Joint Commission journal on quality improvement.