Perceived COVID-19 vaccine effectiveness, acceptance, and drivers of vaccination decision-making among the general adult population: A global survey of 20 countries by Marzo, RR, Ahmad, A, Islam, MS, Essar, MY, Heidler, P, King, I, Thiyagarajan, A, Jermsittiparsert, K, Songwathana, K, Younus, DA, El-Abasiri, RA, Bicer, BK, Pham, NT, Respati, T, Fitriyana, S, Faller, EM, Baldonado, AM, Billah, MA, Aung, Y, Hassan, SM, Asad, MM, El-Fass, KA, Bhattacharya, S, Shrestha, S, Hamza, NAE, Friedmann, P, Head, M, Lin, Y, Yi, S