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Parallel study
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<h2 id="references">References</h2> <ol> <li id="fn:1"><p>Max, Mitchell B.; Joanne Lynn. Symptom Research: Methods and Opportunities. National Institute of Dental and Craniofacial ResearchNational Institutes of Health. <a href="#fnref:1" class="footnote-back-ref">↩</a></p></li> <li id="fn:2"><p>Foulkes, Mary (2008), Study Designs, Objectives, and Hypotheses, Johns Hopkins Bloomberg School of Public Health <a href="#fnref:2" class="footnote-back-ref">↩</a></p></li> </ol>