Patients with systemic lupus erythematosus using hydroxychloroquine or chloroquine develop severe COVID-19 at similar frequency as patients not on antimalarials: need to explore antithrombotic benefits for COVID-19 coagulopathy. Response to: 'Clinical course of COVID-19 in patients with systemic lupus erythematosus under long-term treatment with hydroxychloroquine' by Carbillon et al.