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A prospective, split-face, randomized, comparative study of safety and 12-month longevity of three formulations of hyaluronic acid dermal filler for treatment of nasolabial folds.
[BACKGROUND] Data regarding several hyaluronic acids (HAs) used identically for facial tissue augmentation have heretofore been unavailable. [OBJECTIVES] This prospective, split-face, randomized, two-armed study sought to determine the lon…