However, recent research demonstrates that most <e1>ulcers</e1> of the duodenum are caused by an <e2>infectious agent</e2> named Helicobacter pylori or H. pylori.
However, recent research demonstrates
However, recent research demonstrates that most ulcers of the duodenum are caused by an infectious agent named Helicobacter pylori or H. pylori.
<triplet> ulcers <subject> infectious agent <object> Cause-Effect(e2,e1)