1. Department of Breast Surgery, Gansu Maternal and Child Health Care Hospital, Lanzhou, Gansu Province, P. R. China
2. Key Laboratory of Stem Cells and Gene Drugs of Gansu Province, The 940th Hospital of Joint Logistics Support Force of Chinese People’s Liberation Army, Lanzhou, P.R. China
3. The Second Clinical Medical College, Lanzhou University, Lanzhou, P.R.China
4. State Key Laboratory of Applied Organic Chemistry, College of Chemistry and Chemical Engineering, Lanzhou University, Lanzhou, P. R. China