-<span class="st"> </span><span class="kw">pk_model</span>() <span class="op">+</span></a>
<a class="sourceLine" id="cb1-2" title="2"><span class="st">  </span><span class="kw">pk_absorption_fo</span>() <span class="op">+</span></a>
<a class="sourceLine" id="cb1-3" title="3"><span class="st">  </span><span class="kw">pk_distribution_1cmp</span>() <span class="op">+</span></a>
<a class="sourceLine" id="cb1-4" title="4"><span class="st">  </span><span class="kw">pk_distribution_2cmp</span>() <span class="op">