superscript brackets in citation

Dear all,

I'm having trouble getting in line citations to look like [1-4] and superscripted. I modified the AMA style by adding the prefix and suffix items to the layout tag, but the opening prefix bracket does not get superscripted. The rest is superscripted just fine. Any suggestions? The relevant code is below.

Thanks.

<citation>
<option name="collapse" value="citation-number"/>
<sort>
<key variable="citation-number"/>
</sort>
<layout prefix="[" suffix="]" delimiter="," vertical-align="sup">
<text variable="citation-number" />
<group prefix="(" suffix=")">
<label variable="locator" form="short"/>
<text variable="locator"/>
</group>
</layout>
</citation>
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