Inclusion criteria: |
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1. Guttate or plaque psoriasis, clinically eligible for narrowband UVB (TL-01) phototherapy; |
2. Willing to undergo treatment according to randomisation. |
Exclusion criteria: |
1. No informed consent: |
• age below 18 years; |
• not willing to accept one of the two treatments offered; |
2. Practical reasons: |
• not able to receive one of the two treatments offered (e.g. lack of space at home/living too far from hospital etc.); |
• analphabetism (unable to read the patient information and the questionnaires, unable to provide written answers and written informed consent); |
• lack of command of the Dutch language; |
• not in possession of a telephone. |
3. Expected non-compliance: |
lack of understanding of what the study/treatment is about, and its potential consequences. |
4. Medical contraindications: |
• Malignancy of the skin in the past/at present; |
• known UVB-allergy or chronic polymorphic photodermatosis; |
• use (at time of inclusion) of medication with known phototoxic or photoallergic properties; |
• use (at time of inclusion) of systemic antipsoriatic medication (cyclosporin, methotrexate, neotigason, fumaric acid); |
• history of exposure to ionising radiation. |