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  1. NLM Digital Collections - Hospital literature index (Volume 49) 
    resource.nlm.nih.gov/7807587X36
    ... 1993 Mar-Apr;l 1(2): 123-8 Complement split product C3d as an indicator of disease activity in systemic ... Clinical Immunology, University of Freiburg Medical Center, Germany.) Complement split product C3d as an indicator of disease activity in systemic ...