De Boulle K, Werschler P, Gold MH, Sattler G, Ogilvie P, Mao C, Vitarella D, Lei X, Hardas B. Efficacy and Safety of OnabotulinumtoxinA for Moderate-to-Severe Forehead Lines in Subjects with Upper Facial Lines. J of Skin [Internet]. 2017Oct.27 [cited 2024Jul.22];1(3.1):s73. Available from: https://jofskin.org/index.php/skin/article/view/90