Response to 'Everything we see is a perspective, not the truth' by Chattopadhyay et al. Issue 4 (13th February 2019) - Molto, Anna; Sahuguet, Julie; Fechtenbaum, Jacques; Etcheto, Adrien; López-Medina, Clementina; Richette, Pascal; Dougados, Maxime; Roux, Christian; Briot, Karine