bmjgh/4/6/e001724.full.pdf</a>.</p>
    </div>
    <div id="see-also">
    <h2>See also</h2>
    <div class="dont-index"><p><code><a href="builtin_references.html">builtin_references()</a></code></p></div>
    </div>

    <div id="ref-examples">
    <h2>Examples</h2>
    <div class="sourceCode"><pre class="sourceCode r"><code><span class="r-in"><span><span class="co"># see key-population combinations of builtin_references</span></span></span>
<span class="r-in"><span><span class="fu"><a href="https://rdrr.i