Pediatric Infectious Disease Group (GPIP) position paper on the immune debt of the COVID-19 pandemic in childhood, how can we fill the immunity gap? by Cohen, Robert, Ashman, Marion, Taha, Muhamed-Kheir, Varon, Emmanuelle, Angoulvant, François, Levy, Corinne, Ryback, Alexis, Ouldali, Naim, Guiso, Nicole, Grimprel, Emmanuel