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MS profiles of serial dilution of saliva from healthcare workers. (a) Representative MS spectra of serial dilution of saliva, collected in plastic tube, prepared according to protocol B from two individuals. The dilution rate is indicated at the right part of each profile. (b) Composite correlation index (CCI) matrix representing the levels of MS spectra reproducibility between saliva samples. CCI are expressed as the mean ± standard deviation. #1 and #2: healthcare workers.
