a randomized double-blind study was designed with 65 patients in order to clarify two points : ( 1 ) does addition of a retinoid to psoralen-ultra violet a photochemotherapy ( puva ) of severe psoriasis decrease the uva energy required to achieve remission , and ( 2 ) is there a difference between two retinoids , i.e . etretinate and acitretin .
C0033860
psoriasis
C0050559
acitretin