The Average Facial Expressions: A Range of Motion Analysis for Different Sex and Age Groups by Hilde Schutte, MD, Marvick S. M. Muradin, MD, DMD, PhD, Freek Bielevelt, MSc, Karlien Seubring, MD, DMD, Ronald L. A. W. Bleys, MD, PhD, Antoine J. W. P. Rosenberg, MD, DMD, PhD

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