Resistance to cosmetic botulinum toxin A: A 15-patient case series across 12 sites by Carlos G. Wambier, MD, PhD, Fatima N. Mirza, MD, MPH, Sarah P.F. Wambier, MD, PhD, Vince Bertucci, MD, Jean Carruthers, MD, Joely Kaufman, MD, John Martin, MD, J. Barton Sterling, MD, Flávia Brasileiro, MD, Carolina Marçon, MD, MSc, Allison J. Brown, MD, Miranda Rosenberg, MD, Lilia R.S. Guadanhim, MD, PhD, Doris Hexsel, MD

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