It gives information that allows the reader to contextualize the news, they are useful for adding important details.

http://mcstryon.instructure.com/eportfolios/651/Fludac_20_Mg_Side_Effects
http://cde.instructure.com/eportfolios/293/Fincar_5_Mg_Ultra

縺ゅ縺 メッセージ
Your language needs to be simple, without any words that don t contribute to the focus of the story.