t</a><span class='relatedKey'>.concept_id</span>
    </td>
    <td class='constraint detail'>fpk_drug_concept_s<span title='Restrict delete:
 Parent cannot be deleted if children exist'>&nbsp;R</span></td>
   </tr>
  </table>
 </td>
 <td class='comment detail'>A foreign key to a Drug Concept that refers to the code used in the source.</td>
</tr>
<tr class='odd'>
 <td class='detail'>route_source_value</td>
 <td class='detail'>varchar</td>
 <td class='detail' align='right'>50</td>
 <td class='detail' align='c