Clinical features, treatment and outcome of pediatric patients with severe cutaneous manifestations in IgA vasculitis: Multicenter international study - Sestan, Mario; Kifer, Nastasia; Sozeri, Betul; Demir, Ferhat; Ulu, Kadir; Silva, Clovis Artur Almeida da; Campos, Reinan Tavares; Batu, Ezgi Deniz; Koker, Oya; Sapina, Matej (Seminars in arthritis and rheumatism, 2023)