Measurement of biomarkers

MI Miki Imazu
HF Hiroki Fukuda
HK Hideaki Kanzaki
MA Makoto Amaki
TH Takuya Hasegawa
HT Hiroyuki Takahama
TH Tatsuro Hitsumoto
OT Osamu Tsukamoto
TM Toshisuke Morita
SI Shin Ito
MK Masafumi Kitakaze
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Blood for the serum was collected in tubes; the serum was then separated, and blood for the plasma was collected in ethylenediaminetetraacetic acid (EDTA) tubes; the plasma was then separated and then samples for IS were frozen in plastic tubes at − 80 °C until analysis. We measured IS levels by internal-surface reversed-phase high-performance liquid chromatography (HPLC), with a HPLC system (Shimadzu, Kyoto, Japan), as previously described29. The Japanese-specific eGFR was calculated as follows: [194 × Serum creatinine−1.094 × Age−0.287 × (0.739 for females)]18.

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