[1] COLUMBIA UNIV COLL PHYS & SURG, DEPT PATHOL, DIV OBSTET & GYNECOL PATHOL, NEW YORK, NY 10032 USA
[2] COLUMBIA UNIV COLL PHYS & SURG, DEPT INTERNAL MED, DIV GASTROENTEROL, NEW YORK, NY 10032 USA
[3] SUNY STONY BROOK, DEPT ORAL BIOL & PATHOL, STONY BROOK, NY 11794 USA