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. 2022 Jun 13;14(6):405. doi: 10.3390/toxins14060405
σp = graphic file with name toxins-14-00405-i001.jpg 0.22c if c < 1.2 × 10−7
0.02c 0.8495 if 1.2 × 10−7 ≤ c ≤ 0.138
0.01c 0.5 if c > 0.138