Erratum to: Longitudinal, natural history study reveals the disease burden of idiopathic multicentric Castleman disease - Mateo Sarmiento Bustamante; Sheila K. Pierson; Yue Ren; Adam Bagg; Joshua D. Brandstadter; Gordan Srkalovic; Natalie Mango; Daisy Alapat; Mary Jo Lechowicz; Hongzhe Li; Frits van Rhee; Megan S. Lim; et al. (Haematologica)