Corrigendum to “Adipose-Derived Mesenchymal Stem Cells in the Regeneration of Vocal Folds: A Study on a Chronic Vocal Fold Scar” - Valerie Angelou; Vassiliki Kalodimou; Irini Messini; Nikolaos Psychalakis; Eleftheria Karampela; Apostolos Papalois (Stem Cells International)