Letter

Spuriously low IgG levels in lupus-associated mixed cryoglobulinaemia type II complicated by iatrogenic immunoglobulin-induced immune complex vasculitis

F. Kollert, K. Balcarek, C. Müller-Schmah, J. Thoden, J. Thiel, N. Venhoff, N. Effelsberg, M. Schlesier, K. Warnatz, P. Vaith, R.E. Voll