Workhorse free functional muscle transfer techniques for smile reanimation in children with congenital facial palsy: case report and systematic review of the literature - Gasteratos, K; Azzawi, S A; Vlachopoulos, N; Lese, I; Spyropoulou, G A; Grobbelaar, A O (J Plast Reconstr Aesthet Surg, 2021)