Galanis, P. Vraka, I. Siskou, O. Konstantakopoulou, O. Katsiroumpa, A. Kaitelidou, D., Willingness, refusal and influential factors of parents to vaccinate their children against the COVID-19: A systematic review and meta-analysis, ISRN Preventive Medicine, (157), 2022, Academic Press Inc., 2090-8784