Demographics of study participants and reasons for declining participation. CIN2+, cervical intraepithelial neoplasia grade 2+; GCSE, General Certificate of Secondary Education; PG, postgraduate; UG, undergraduate. Demographics of study participants and reasons for declining participation. CIN2+, cervical intraepithelial neoplasia grade 2+; GCSE, General Certificate of Secondary Education; PG, postgraduate; UG, undergraduate. Alex Sargent et al. BMJ Open 2019;9:e025388 ©2019 by British Medical Journal Publishing Group