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. 2021 Feb 26;37(2):129–140. doi: 10.1007/s12550-021-00423-1

Fig. 1.

Fig. 1

Relative analyte recovery rates after blank urine was spiked at medium concentration levels and stored as dried urine spots for 7, 14 and 28 days at 22 °C; n = 4 for each storage time