Tazarotene cream for the treatment of facial photodamage: a multicenter, investigator-masked, randomized, vehicle-controlled, parallel comparison of 0,01 %, 0,05 %, and 0,1 % tazarotene creams with 0,05 % tretinoin emollient cream applied once daily for 24 weeks. - Kang,S.; Leydon,J.J.; Lowe,N.J. (Arch Dermatol, 2001)