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. 2019 Jun 11;9(6):e025129. doi: 10.1136/bmjopen-2018-025129

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© Author(s) (or their employer(s)) 2019. Re-use permitted under CC BY-NC. No commercial re-use. See rights and permissions. Published by BMJ.

This is an open access article distributed in accordance with the Creative Commons Attribution Non Commercial (CC BY-NC 4.0) license, which permits others to distribute, remix, adapt, build upon this work non-commercially, and license their derivative works on different terms, provided the original work is properly cited, appropriate credit is given, any changes made indicated, and the use is non-commercial. See: http://creativecommons.org/licenses/by-nc/4.0/.

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General structure of the PAPCLEAR study. For the longitudinal study, participants have an inclusion visit (V ₁), a results visit (V ₂) and then return visits (Vi with i>2). For the cross-sectional study, participants only have V ₁ and V ₂. HPV, human papillomavirus; STI, sexually transmitted infection.