Expression of concern to: High systematic levels of the cytokine-inducing HMGB1 isoform secreted in severe macrophage activation syndrome - Karin Palmblad; Hanna Schierbeck; Erik Sundberg; Anna-Carin Horne; Helena Erlandsson Harris; Jan-Inge Henter; Daniel J. Antoine; Ulf Andersson (BMC, 2020)