Automated objective and marker-free facial grading using photographs of patients with facial palsy. - Mothes O; Modersohn L; Volk GF; Klingner C; Witte OW; Schlattmann P; Denzler J; Guntinas-Lichius O (European archives of oto-rhino-laryngology : official journal of the European Federation of Oto-Rhino-Laryngological Societies (EUFOS) : affiliated with the German Society for Oto-Rhino-Laryngology - Head and Neck Surgery, 2019)