1 Biomedical and Optical Imaging Laboratory, Deparstments of Medicine and Bioengineering, University of Pittsburgh, Pittsburgh, PA, 15213, USA. hongqiang.ma@pitt.edu.
2 Biomedical and Optical Imaging Laboratory, Deparstments of Medicine and Bioengineering, University of Pittsburgh, Pittsburgh, PA, 15213, USA.
3 Department of Pathology, West China Second University Hospital, Sichuan University, Chengdu, 610041, People's Republic of China.