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P value comparison between two types of devices over time. Flow rate was changed from 0.5 mL/h to 0.05 mL/h at time 0 minute. After 1 minute, the flow rate in channel became stable. Cell throughput in the parallel inlet device maintained at a constant level (19.4%±1.9%), while it decreased from 17.8%±1.0% (1 min) to 1.2%±0.2% (5 min) in the vertical inlet device. Error bar represents relative counting error (n = 2000 cells for vertical inlet, n = 1000 for parallel inlet).
