chor" aria-label="anchor" href="#arg-env"></a></dt>
<dd><p>Optional, provide environment of original visit data. Default:
parent.frame().</p></dd>


<dt id="arg-event-names">event_names<a class="anchor" aria-label="anchor" href="#arg-event-names"></a></dt>
<dd><p>vector, contains the event names, default = "event"</p></dd>


<dt id="arg-col-names">col_names<a class="anchor" aria-label="anchor" href="#arg-col-names"></a></dt>
<dd><p>named list, indicate study_id, site_id, patient_id and visit
column in df_vi