Treatment(32) COVID-19(31) lung(23) Radiotherapy(21) Pneumonia(21) randomized trial(20) Patient(19) Trial(15) radiation therapy(13) material(12) Oxygenation(12) clinical recovery(12) low-dose(10) radiological(10) dose(10) distress(10) ferritin(9) CRP(9) steroid(9) pandemic(9) anti-inflammatory effect(9) baseline(9) Blood(9) COVID(9) therapy(9) Anti-inflammatory therapy(8) C-reactive protein(8) Significant(8) Hospitalization(8) cytokine release(8)