Hypocomplementemia is related to elevated serum levels of IgG subclasses other than IgG4 in IgG4-related kidney disease

Yuhei Fujisawa, Ichiro Mizushima^*, Kazunori Yamada, Motohisa Yamamoto, Takako Saeki, Shoko Matsui, Syunsuke Tsuge, Satoshi Hara, Kiyoaki Ito, Hiroshi Fujii, Hiroki Takahashi, Hideki Nomura, Shigeyuki Kawa, Mitsuhiro Kawano