1. Guangdong Key Laboratory for Biomedical Measurements and Ultrasound Imaging Department of Biomedical Engineering; School of Medicine; Shenzhen University; Shenzhen 518060 China
2. State Key Laboratory of Cancer Biology; Xijing Hospital of Digestive Diseases; Fourth Military Medical University; Xi'an 710032 China
3. Laboratory of Molecular Imaging and Nanomedicine (LOMIN); National Institute of Biomedical Imaging and Bioengineering (NIBIB); National Institutes of Health; Bethesda MD 20892 USA
4. Laboratory of Cellular Imaging and Macromolecular Biophysics; National Institute of Biomedical Imaging and Bioengineering (NIBIB); National Institutes of Health; Bethesda MS 20892 USA