COVID-19(59) SARS-CoV-2(24) Abstract(21) Hemodialysis(19) dialysis(17) vaccination(15) response(12) kidney(11) Patient(10) Participants(10) Acute kidney injury(10) children(10) Kidney transplantation(9) idiopathic nephrotic syndrome(9) IgG(9) Vaccine(8) 95% confidence interval(7) Vaccines(7) coronavirus disease(7) rituximab(7) nephrotic syndrome(7) Mortality(7) maintenance(7) Peritoneal dialysis(7) Chronic kidney disease(6) coronavirus(6) Viral(6) steroid dependent nephrotic syndrome(6) Coronavirus disease 2019(6) Infection(6)