Corrigendum: Hypoxia Onset in Mesenchymal Stem Cell Spheroids: Monitoring With Hypoxia Reporter Cells - Schmitz, Carola; Potekhina, Ekaterina; Irianto, Teresa; Belousov, Vsevolod V.; Lavrentieva, Antonina (Frontiers in Bioengineering and Biotechnology, 2022)