RT Journal Article SR Electronic T1 Black esophagus JF Cleveland Clinic Journal of Medicine JO Cleve Clin J Med FD Cleveland Clinic SP 400 OP 400 DO 10.3949/ccjm.76a.08102 VO 76 IS 7 A1 Akkinepally, Sudha A1 Poreddy, Vijayarama A1 Moreno, Alejandro YR 2009 UL http://www.ccjm.org/content/76/7/400.abstract AB