private function _get_users_vars()
{
return array('member_id', 'group_id', 'group_description', 'group_title', 'username', 'screen_name', 'email', 'ip_address', 'location', 'total_entries', 'total_comments', 'private_messages', 'total_forum_posts', 'total_forum_topics', 'total_forum_replies');
}