SARS-CoV-2 Variants of Concern and Clinical Severity in the Mexican Pediatric Population oleh Anahí Maldonado-Cabrera, Jesus Alejandro Colin-Vilchis, Ubydul Haque, Carlos Velazquez, Andrea Socorro Alvarez Villaseñor, Luis Eduardo Magdaleno-Márquez, Carlos Iván Calleros-Muñoz, Karen Fernanda Figueroa-Enríquez, Aracely Angulo-Molina, Ana Lucía Gallego-Hernández