Patients with basal cell carcinoma in history (up to 10 years before inclusion) with or without squamous cell carcinoma or actinic keratosis but no other skin cancers (melanoma or non-melanoma skin cancer)

Patients with squamous cell carcinoma in history (up to 10 years before inclusion) with or without basal cell carcinoma or actinic keratosis but no other skin cancers (melanoma or non-melanoma skin cancer)

Patients with actinic keratosis in history (up to 10 years before inclusion) with or without basal cell carcinoma or squamous cell carcinomas but no other skin cancers (melanoma or non-melanoma skin cancer)

EQ-5D-5L questionnaire questioning their overall health on five dimensions (mobility, self-care, usual activities, pain/discomfort, and anxiety/depression). In addition patients will have to fill in the generic 15D questioning 15 specific dimensions on 5 levels as well as the BaSQoL, which is a disease specific questionnaire for patients with KC. The Time-trade off task is the final question.

Utilities as determined by the time trade off, this is a technique used to measure the quality of life that a person or group is experiencing. An individual will be presented with a set of directions such as, and the result will be a health utility index between 0-1. Lower scores mean less HrQoL.

Utilities as determined by the 15D questionnaire, a generic questionnaire developed to determine a health utility index between 0-1. Lower scores mean less HrQoL.

Utilities as determined by the EQ-5D questionnaire, a generic questionnaire developed to determine a health utility index between 0-1. Lower scores mean less HrQoL.