1 Department of Medicine, McMaster University, Hamilton, ON, Canada.
2 Department of Haematology, Sorbonne Université, UMRS 1166, Assistance Publique Hôpitaux de Paris, Pitié-Salpêtrière Hospital, Paris, France.
3 Assistance Publique-Hopitaux de Paris, Saint-Louis Hospital, Center of Reference for Rare Systemic Autoimmune Diseases, Université de Paris, Paris 75010, France; Department of Medicine, McGill University, Montreal, QC, Canada. Electronic address: itaccme@gmail.com.