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Alluvial plots of the longitudinal (A) oral and (B) cervicogenital human papillomavirus (HPV) status of participants in the Michigan HPV and Oropharyngeal Cancer study (data collected in Ann Arbor, Michigan, USA, 2015–2017). Note that the cervicogenital testing was rolled out later than oral testing, so that the majority of ‘invalid/not tested’ participants in (B) represent individuals who participated in several study visits prior to the enrolling in the cervicogenital substudy.
