Response to: 'Severe COVID-19 associated pneumonia in 3 patients with systemic sclerosis treated with rituximab' by Avouac et al. Issue 3 (5th June 2020) - Guilpain, Philippe; Le Bihan, Clément; Foulongne, Vincent; Taourel, Patrice; Pansu, Nathalie; Maria, Alexandre Thibault Jacques; Jung, Boris; Larcher, Romaric; Klouche, Kada; Le Moing, Vincent