Orbit-infiltrating mast cells, monocytes, and macrophages produce PDGF isoforms that orchestrate orbital fibroblast activation in Graves’ ophthalmopathy - van Steensel, L; Paridaens, D; van Meurs, M; van Hagen, P M; van den Bosch, W A; Kuijpers, R W; Drexhage, H A; Hooijkaas, H; Dik, W A (J Clin Endocrinol Metab, 2012)