METHODS	In this 8-week , multicenter , randomized , double-blind study , patients with scalp psoriasis were randomized to treatment with the two-compound scalp formulation ( calcipotriene 50 microg/g plus betamethasone 0.5 mg/g , as dipropionate ) ( n = 541 ) , betamethasone 0.5 mg/g ( as dipropionate ) in the same vehicle ( n = 556 ) , calcipotriene 50 microg/g in the same vehicle ( n = 272 ) , or vehicle alone ( n = 136 ) .\