Trioxsalen bath PUVA did not increase the risk of squamous cell skin carcinoma and cutaneous malignant melanoma in a joint analysis of 944 Swedish and Finnish patients with psoriasis. - Hannuksela-Svahn,A.; Sigurgeirsson,B.; Pukkala,E.; Lindelöf,B.; Berne,B.; Hannuksela,M.; Poikolainen,K.; Karvonen,J. (Br J, 1999)