diff --git a/human-mutation.csl b/human-mutation.csl
index ad749fcb3e..13f9678cca 100644
--- a/human-mutation.csl
+++ b/human-mutation.csl
@@ -13,7 +13,7 @@
     <category field="medicine"/>
     <issn>1059-7794</issn>
     <eissn>1098-1004</eissn>
-    <updated>2012-09-27T22:06:38+00:00</updated>
+    <updated>2016-12-27T20:07:23+00:00</updated>
     <rights license="http://creativecommons.org/licenses/by-sa/3.0/">This work is licensed under a Creative Commons Attribution-ShareAlike 3.0 License</rights>
   </info>
   <macro name="author-short">
@@ -52,8 +52,10 @@
       <key macro="author-short"/>
     </sort>
     <layout prefix="(" suffix=")" delimiter="; ">
-      <text macro="author-short"/>
-      <text macro="issued" prefix=" "/>
+      <group delimiter=", ">
+        <text macro="author-short"/>
+        <text macro="issued"/>
+      </group>  
     </layout>
   </citation>
   <bibliography et-al-min="13" et-al-use-first="12">