The authors regret missing information in the manuscript in Section 3.10. Incorrect version To evaluate the feasibility of PV/Cu2+-GO/Alg hydrogels in a real urine sample, the hydrogel sensor was applied to measure cysteine in human urine on a diaper, as illustrated in Fig. 7. Corrected version <Please add “(IRB No.192/63)” in the 2nd line of Section 3.10 and the sentence will be “To evaluate the feasibility of PV/Cu2+-GO/Alg hydrogels in a real urine sample, the hydrogel sensor was applied to measure cysteine in human urine (IRB No.192/63) on a diaper, as illustrated in Fig. 7.”>. The authors would like to apologize for any inconvenience caused.
