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Psoriasis
Skin Neoplasms
Squamous Cell Carcinoma
Basal Cell Carcinoma
Skin Diseases
Drug Eruptions
PUVA Therapy
Office Visits
Ultraviolet Therapy
Prospective Studies
Incidence
Risk Factors
Cohort Studies
Severity of Illness Index
Quality of Life
United States
Dermatology
Ficusin
Methoxsalen
Questionnaires
Co-Publications
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