e Standardized Vocabularies for the Drug concept.</td>
</tr>
<tr class='odd'>
 <td class='detail'>drug_exposure_start_date</td>
 <td class='detail'>date</td>
 <td class='detail' align='right'>13</td>
 <td class='detail' align='center'></td>
 <td class='detail' align='center'></td>
 <td class='detail'></td>
 <td class='detail'></td>
 <td class='detail'> </td>
 <td class='comment detail'>The start date for the current instance of Drug utilization. Valid entries include a start date of a prescription, the date