Qingjun Liu, PhD, is Professor of the Biosensor National Special Laboratory and Director of the Biomedical Engineering Institute, Zhejiang University, China. He is also the member of Steering Committee of Biomedical Engineering in Colleges and Universities of the Ministry of Education of People's Republic of China, and member of the China Micron Nanotechnology Society. His interests mainly focus on biomedical sensing and detection research, especially in wearable and portable sensing technologies.