Response to: 'Correspondence on 'Lung involvement in macrophage activation syndrome and severe COVID-19: results from a cross-sectional study to assess clinical, laboratory and artificial intelligence–radiological differences' by Ruscitti et al' by Chen et al. Issue 11 (9th September 2020) - Ruscitti, Piero; Bruno, Federico; Berardicurti, Onorina; Acanfora, Chiara; Pavlych, Viktoriya; Palumbo, Pierpaolo; Conforti, Alessandro; Carubbi, Francesco; Di Cola, Ilenia; Di Benedetto, Paola; Cipriani, Paola; Grassi, Davide; et al.