CD4⁺FOXP3⁺ regulatory T cells are abundantly present in inflamed muscle of patients with juvenile dermatomyositis by van Royen- Kerkhof Annet, Wedderburn Lucy, de Weger R, Spliet Wim, Klein Mark, Bakker Mette H, van Schieveen Christa, Varsani Hemlata, Plantinga Maud, Meerding Jenny, Elst Elisabeth F, Vercoulen Yvonne, Prakken Berent J