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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 ...
  2. NLM Digital Collections - Correspondence and memoranda 
    https://resource.nlm.nih.gov/2935050RX2
    ... been a glight rise in hia epidemic typhus complement fixing antibodies, Another blood was drawn today and I'11 ...