Onset and duration of effect of incobotulinumtoxinA, onabotulinumtoxinA, and abobotulinumtoxinA in the treatment of glabellar frown lines: a randomized, double-blind study
Thomas Rappl,1 Daryousch Parvizi,1 Herwig Friedl,2 Maria Wiedner,1 Simone May,1 Bettina Kranzelbinder,3 Paul Wurzer,1 Bengt Hellbom1,† 1Department of Plastic and Reconstructive Surgery, Medical University Graz, Graz, Austria; 2Institute of Statistics, Graz University of Technology, Graz, Austria; 3Department of Dermatology, Medical Universit