Implantable QR code subcutaneous microchip using photoacoustic and ultrasound microscopy for secure and convenient individual identification and authentication oleh Nan Wan, Pengcheng Zhang, Zuheng Liu, Zhe Li, Wei Niu, Xiuye Rui, Shibo Wang, Myeongsu Seong, Pengbo He, Siqi Liang, Jiasheng Zhou, Rui Yang, Sung-Liang Chen