ing for Study Protocol</a></li>
    <li><a class="dropdown-item" href="../articles/chapter6_DataImputation.html">6. How GGIR Deals with Invalid Data</a></li>
    <li><a class="dropdown-item" href="../articles/chapter7_DescribingDataWithoutKnowingSleep.html">7. Describing the Data Without Knowing Sleep</a></li>
    <li><a class="dropdown-item" href="../articles/chapter8_SleepFundamentalsSibs.html">8. Sleep Fundamentals - Sustained Inactivity Bout Detection (SIB)</a></li>
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