-28 2018-06-08 2017-02-14</span>
<span class="co">#&gt;   author_association</span>
<span class="co">#&gt; 1               NONE</span>
<span class="co">#&gt; 2               NONE</span>
<span class="co">#&gt; 3               NONE</span>
<span class="co">#&gt; 4               NONE</span>
<span class="co">#&gt; 5               NONE</span>
<span class="co">#&gt; 6               NONE</span>
<span class="co">#&gt;                                                                                                    