[1] UT Southwestern Med Ctr, Parkland Hlth & Hosp Syst, Dept Internal Med, Dallas, TX USA
[2] Univ Miami, Dept Internal Med, Sylvester Comprehens Canc Ctr, Miami, FL USA
[3] UT Southwestern Med Ctr, Dept Internal Med, Dallas, TX USA
[4] UT Southwestern Med Ctr, Dept Surg, Dallas, TX USA
[5] UT Southwestern Med Ctr, Div Digest & Liver Dis, 5959 Harry Hines Blvd,POB 1,Suite 420, Dallas, TX 75390 USA