1. Department of Biophysics and Structural BiologyInstitute of Basic Medical SciencesChinese Academy of Medical Sciences & School of Basic MedicinePeking Union Medical College Beijing 100005 P. R. China
2. Department of LaboratoryTumor Hospital of Jilin Province Changchun 130012 P. R. China
3. Department of Clinical LaboratoryHeze Municipal Hospital Shandong 274031 P. R. China