Editorial: Childhood vaccination and COVID-19 - Mallhi, Tauqeer Hussain; Salman, Muhammad; Khan, Yusra Habib; Khan, Faiz Ullah; Butt, Muhammad Hammad; Ung, Carolina Oi Lam; Khan, Amjad; Aftab, Raja Ahsan (Frontiers in Pediatrics, 2023)