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. 2019 Nov 13;19(22):4940. doi: 10.3390/s19224940

Table 1.

Solution concentrations at different levels.

1 2 3 4 5 6
Level 1 0% 100%
Level 2 0% 50% 100%
Level 3 0% 40% 60% 100%
Level 4 0% 30% 50% 70% 100%
Level 5 0% 20% 40% 60% 80% 100%