before_sent:  Later we point out some of the interesting findings of all papers and challenges that need to be overcome in order to move forward in this field.
before_sent_with_intent: <clarity>  Later we point out some of the interesting findings of all papers and challenges that need to be overcome in order to move forward in this field.
after_sent:  Later we point out some of the interesting findings of all papers and challenges that need to be overcome to move forward in this field.