A Comprehensive Review on the Current Vaccines and Their Efficacies to Combat SARS-CoV-2 Variants oleh Ali A. Rabaan, Abbas Al Mutair, Khalid Hajissa, Amal H. Alfaraj, Jumana M. Al-Jishi, Mashael Alhajri, Sara Alwarthan, Shahab A. Alsuliman, Amal H. Al-Najjar, Ibrahim A. Al Zaydani, Ghadeer Hassan Al-Absi, Sana A. Alshaikh, Mohammed S. Alkathlan, Souad A. Almuthree, Abdulsalam Alawfi, Amer Alshengeti, Fatimah Z. Almubarak, Mohammed S. Qashgari, Areeg N. K. Abdalla, Saad Alhumaid