[1] TULANE UNIV, SCH MED, NEW ORLEANS, LA 70112 USA
[2] SCOTT & WHITE MEM HOSP, TEMPLE, TX 76501 USA
[3] VET ADM MED CTR, SALT LAKE CITY, UT 84148 USA
[4] UNIV NEW MEXICO HOSP, ALBUQUERQUE, NM USA
[5] UNIV MISSISSIPPI, MED CTR, JACKSON, MS 39216 USA
[6] ST PAUL GASTROENTEROL LTD, ST PAUL, MN USA
[7] VIRGINIA COMMONWEALTH UNIV, MED COLL VIRGINIA, RICHMOND, VA 23298 USA
[8] UNIV ROCHESTER, ROCHESTER, NY 14627 USA
[9] HOSP UNIV PENN, PHILADELPHIA, PA 19104 USA
[10] VET ADM HOSP, HINES, IL 60141 USA