hi.<br/>"A question <u>so</u> basic to the issue as the distinction between risk and protection must be resolved to allow researchers to consider them in their studies."<br/><a href="http://focus.psychiatryonline.org/article.aspx?Volume=2&page=558&journalID=21"><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> </a><br/><br/>May I replace 'so' with 'as' here?