IgM monoclonal gammopathy with heavy-and-light-chain amyloidosis resembling fibrillary glomerulonephritis determined by tandem mass spectrometry: a case report by Misa Adachi, Mineaki Kitamura, Kumiko Muta, Akihiro Maekawa, Tadashi Uramatsu, Masato Tadokoro, Satoshi Funakoshi, Satoshi Hisano, Naomi Kuwahara, Akira Shimizu, Hiroshi Mukae, Tomoya Nishino

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