Women who choose to participate will be sampled and monitored according to the standards of care in the regional cancer screening program. HPV-positive women will be followed by colposcopy and biopsy according to standard clinical guidelines. Women will be invited over the course of 3 months. All letters will be printed in advance with pre-marked dates. Batches will be sent out weekly and checked against changes in the population registry data (for individuals that have moved, taken a smear, died, or unregistered, invitation letters will be sorted out and those individuals marked in the database).