Xiong, L.; Han, M.; Wang, C.; Liu, K.; Liu, T. Frailty Is an Independent Determinant of COVID-19 Vaccine Hesitancy in the Elderly: A Cross-Sectional Study: Frailty Is a Determinant of COVID-19 Vaccine Hesitancy. Cell Mol Biol (Noisy-le-grand) 2022, 68, 202-207.