Acute and long-term outcomes of SARS-CoV-2 infection in school-aged children in England: Study protocol for the joint analysis of the COVID-19 schools infection survey (SIS) and th... oleh Katharine J Looker, Elliot McClenaghan, Alison Judd, Livia Pierotti, Harriet Downing, Jody Phelan, Charlotte Warren-Gash, Kalu Ngozi, Fiona Dawe, Caroline Relton, Hannah Christensen, Alastair D Hay, Punam Mangtani, Patrick Nguipdop-Djomo, Rachel Denholm