1. Gansu Provincial Maternity and Child-care Hospital (Gansu Provincial Central Hospital), Lanzhou 730050, China
2. Beijing Advanced Innovation Center for Biomedical Engineering, School of Biological Science and Medical Engineering, Beihang University, Beijing 100191, China
3. College of Life Science, Northwest Normal University, Lanzhou 730070, China
4. Department of Integrative Medical Biology, Umeå University, Umeå 90337, Sweden