1Oklahoma Foundation for Digestive Research, University of Oklahoma Health Sciences Center, Oklahoma City, Oklahoma, USA
2Department of Medicine, Graduate Hospital, Philadelphia, USA
3Division of Biostatistics, AstraZeneca, LP, Wilmington, Delaware, USA
4Division of Clinical Research, AstraZeneca, LP, Wilmington, Delaware, USA
Reprint requests and correspondence: Philip Miner, Jr, MD, Oklahoma Foundation for Digestive Research, University of Oklahoma Health Sciences Center, 711 Stanton L. Young Boulevard, Suite 619, OklahomaCity, OK 73104, USA.
Received 14 May 2003; accepted 30 September 2003