Correction: B-Cell-Attracting Chemokine CXCL13 As a Marker of Disease Activity in Systemic Lupus Erythematosus (SLE) - Omran, Eman Ahmed Hamed; El-Hakeim, Eman H.; Galal, Marwa A. A.; Nasr, Nada M. M.; Mosaad, Eman (Aktuelle Rheumatologie, 2019)