[1] Gastroenterol & Hepatol, Seattle, WA USA
[2] Brooke Army Med Ctr, ALAMO Study Grp, San Antonio, TX USA
[3] Texas Digest Dis Consultants, Flower Mound, TX USA
[4] M Broward PA, Tamarac, FL USA
[5] Digest Dis Ctr S Texas, San Antonio, TX USA
[6] San Antonio Gastroenterol, San Antonio, TX USA
[7] GI Associates Houston, Houston, TX USA