Here is the Injury Prevention csl file with the revisions adamsmith suggested. There is only one more thing needed but (unless I am mistaken) the current CSL doesn't allow it. That is the first author name and initials should be bold face (but now all authors and not book editors). This is relatively easy to do manually. This style is similar to Vancouver and AMA but uses different spacing and punctuation. Also, all documents with doi numbers (published in print or online or pending) should display the doi numbers. I have tried to post it online but I seem to be unable to do it.

<?xml version="1.0" encoding="UTF-8"?>
<style xmlns="http://purl.org/net/xbiblio/csl" class="in-text" xml:lang="en">
<info>
<title>Injury Prevention</title>
<id>http://www.zotero.org/styles/injury-prevention</id>;
<link href="http://www.zotero.org/styles/injury-prevention"/>
<author>
<name>Julian Onions</name>
<email>julian.onions@gmail.com</email>
</author>
<author>
<name>Michael Berkowitz</name>
<email>mberkowi@gmu.edu</email>
</author>
<contributor>
<name>David Lawrence</name>
<email>david.lawrence@sdsu.edu</email>
</contributor>
<category term="numeric"/>
<category term="medicine"/>
<category term="public_health"/>
<category term="sociology"/>
<updated/>
<summary>The Injury Prevention (a BMJ Group journal) style is a modified and hybrid version of Vancouver and AMA styles: In-text citation -square brackets, collapsed. Bibliography-- doi strings always when available; special punctuation and spacing; first author and journal volume bold; journal abbreviation italics; authors et. al four or more; year-only date.</summary>
<link href="http://injuryprevention.bmj.com/site/about/guidelines.xhtml"/>
</info>
<macro name="editor">
<names variable="editor">
<name name-as-sort-order="all" sort-separator=" " initialize-with="" delimiter=", " delimiter-precedes-last="always"/>
<label form="short" prefix=", " text-case="lowercase" suffix="."/>
</names>
</macro>
<macro name="anon">
<text term="anonymous" form="short" text-case="capitalize-first"/>
</macro>
<macro name="author">
<group suffix=".">
<names variable="author">
<name name-as-sort-order="all" sort-separator=" " initialize-with=""
delimiter=", " delimiter-precedes-last="always"/>
<label form="short" prefix=" " suffix="" text-case="lowercase"/>
<substitute>
<names variable="editor"/>
<text macro="anon"/>
</substitute>
</names>
</group>
</macro>
<macro name="author-short">
<names variable="author">
<name form="short" and="symbol" delimiter=", " initialize-with="."/>
<substitute>
<names variable="editor"/>
<names variable="translator"/>
<text macro="anon"/>
</substitute>
</names>
</macro>
<macro name="access">
<group>
<text value="Available at:" suffix=" "/>
<text variable="URL"/>
<group prefix=" (" suffix=")">
<text term="accessed" text-case="lower" suffix=" "/>
<date variable="accessed">
<date-part name="month" suffix=" "/>
<date-part name="day" suffix=", "/>
<date-part name="year"/>
</date>
</group>
</group>
</macro>
<macro name="title">
<choose>
<if type="book">
<text variable="title" font-style="italic"/>
</if>
<else>
<text variable="title"/>
</else>
</choose>
</macro>
<macro name="publisher">
<group delimiter=": ">
<text variable="publisher-place"/>
<text variable="publisher"/>
</group>
</macro>
<macro name="year-date">
<group prefix=" ">
<choose>
<if variable="issued">
<date variable="issued">
<date-part name="year"/>
</date>
</if>
<else>
<text term="no date"/>
</else>
</choose>
</group>
</macro>
<macro name="edition">
<choose>
<if is-numeric="edition">
<group delimiter=" ">
<number variable="edition" form="ordinal"/>
<text term="edition" form="short" suffix="."/>
</group>
</if>
<else>
<text variable="edition" suffix="."/>
</else>
</choose>
</macro>
<citation>
<option name="collapse" value="citation-number"/>
<sort>
<key variable="citation-number"/>
</sort>
<layout prefix="[" suffix="]" delimiter=",">
<text variable="citation-number"/>
</layout>
</citation>
<bibliography>
<option name="line-spacing" value="2"/>
<option name="hanging-indent" value="false"/>
<option name="et-al-min" value="4"/>
<option name="et-al-use-first" value="3"/>
<layout>
<text variable="citation-number" prefix="" suffix=". "/>
<text macro="author" suffix=""/>
<choose>
<if type="book">
<group suffix=".">
<text macro="title" prefix=" " suffix="."/>
<text macro="edition" prefix=" " />
<text macro="editor" prefix=" (" suffix=")"/>
</group>
<text prefix=" " suffix="" macro="publisher"/>
<group suffix="." prefix="; ">
<date variable="issued">
<date-part name="year"/>
</date>
<text variable="page" prefix=":"/>
</group>
</if>
<else-if type="chapter">
<text macro="title" prefix=" " suffix="."/>
<group class="container" prefix=" ">
<text term="in" text-case="capitalize-first" suffix=": "/>
<text macro="editor"/>
<text variable="container-title" font-style="italic" prefix=" " suffix="."/>
<text variable="volume" prefix="Vol " suffix="."/>
<text macro="edition" prefix=" "/>
<text variable="collection-title" prefix=" " suffix="."/>
<group suffix=".">
<text macro="publisher" prefix=" "/>
<group suffix="." prefix=" ">
<date variable="issued">
<date-part name="year"/>
</date>
<text variable="page" prefix=":"/>
</group>
</group>
</group>
</else-if>
<else>
<group suffix=".">
<text macro="title" prefix=" " />
<text macro="editor" prefix=" "/>
</group>
<group class="container" prefix=" " suffix=".">
<text variable="container-title" font-style="italic" form="short" suffix=""/>
<group delimiter=";" prefix=" ">
<date variable="issued">
<date-part name="year"/>
</date>
<group>
<text variable="volume" font-weight="bold"/>
<text variable="issue" prefix="(" suffix=")"/>
</group>
</group>
<text variable="page" prefix=":"/>
<text variable="DOI" prefix=". doi:"/>
</group>
</else>
</choose>
<text prefix=" " macro="access" suffix="."/>
</layout>
</bibliography>
</style>