Table 1.

Inclusion/exclusion criteria.

P: Population/setting	Inclusion: Studies presenting primary data on ‘underserved’ groups (or those at risk of being underserved). Studies set in European countries. Studies published since 2000. Exclusion: Studies not presenting primary data on ‘underserved’ groups (or those at risk of being underserved) (see text). Studies set outside Europe. Studies published before 2000.
I: Intervention/exposure	Inclusion: Barriers and facilitators identified by underserved women/women at risk of being underserved, pertaining to any aspect of the CCS secondary prevention continuum, extending until discharge or diagnosis. Barriers and facilitators identified by those other than the target population (e.g., healthcare providers). Interventions to improve participation across the whole CCS secondary prevention continuum among women considered to be underserved. Exclusion: Interventions for primary prevention (e.g., HPV vaccination). Interventions for tertiary prevention (e.g., treatment of cervical cancer). Barriers and facilitators related to primary or tertiary prevention.
C: Comparison/control	Inclusion: Comparisons with experience of general population. Exclusion: No comparison with general population.
O: Outcome	Inclusion: Studies reporting CCS participation (e.g., uptake, adherence, etc.) and studies reporting barriers to, and facilitators of, CCS participation or interventions to improve participation.
S: Study design(s)	Inclusion: Systematic and scoping reviews were not included. No further restrictions on study types.