Acknowledgement
We would like to thank Dr. HG Lee for providing feedback on the workflow of droplet digital PCR. This research was supported by a National Research Foundation (NRF) grant funded by the Korean government (MSIT) (NRF-2016R1A6A1A03012647, NRF-2020R1A2C3005053, NRF-2022M3I6A1085991) to KYK.
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