public function fetch_comments($where)
 {
     $result = Dbl::qe("select PaperComment.*, firstName reviewFirstName, lastName reviewLastName, email reviewEmail\n            from PaperComment join ContactInfo on (ContactInfo.contactId=PaperComment.contactId)\n            where {$where} order by commentId");
     $comments = array();
     while ($c = CommentInfo::fetch($result, $this)) {
         $comments[$c->commentId] = $c;
     }
     Dbl::free($result);
     return $comments;
 }