 .. ..$ n_visits  : int 1967</span>
<span class="r-out co"><span class="r-pr">#&gt;</span>   .. ..$ n_events  : num 946</span>
<span class="r-out co"><span class="r-pr">#&gt;</span>   ..$ str_call   : chr "df_visit"</span>
<span class="r-out co"><span class="r-pr">#&gt;</span>   ..$ event_names: chr "event"</span>
<span class="r-out co"><span class="r-pr">#&gt;</span>   ..$ col_names  :List of 4</span>
<span class="r-out co"><span class="r-pr">#&gt;</span>   .. ..$ study_id  : chr "study_id"</span>
<span cl