add comma delimiter between succesive numbers

Add comma between (non-sequential) numbers

Author: JohannesNE

british-journal-of-anaesthesia.csl

@@ -215,7 +215,7 @@
     <sort>
       <key variable="citation-number"/>
     </sort>
-    <layout delimiter=" " vertical-align="sup">
+    <layout delimiter=", " vertical-align="sup">
       <text variable="citation-number"/>
     </layout>
   </citation>