Hi.<br/>"Risk factors then impinge on progress to that outcome"<br/><a href='http://focus.psychiatryonline.org/article.aspx?Volume=2&page=558&journalID=21' target='_blank' rel='nofollow'>http://focus.psychiatryonline.org/article.aspx?Volume=2&page=558&journalID=21</a><br/><br/>May I replace impinge on with:<br/>1)collide with<br/>2)obstruct