Corresponding Author
Kehu Yang
Address: Evidence-Based Medicine Center, School of Basic Medical
Sciences, Lanzhou University, No. 199, Donggang WestRoad, Chengguan
District, Lanzhou, Gansu 730000, China.
Phone: +8613893117077
E-mail addresses: kehuyangebm2006@126.com
Xinrong Liu
Address: School of Public Health, Lanzhou University, No. 199, Donggang
WestRoad, Chengguan District, Lanzhou, Gansu 730000, China.
Phone: +8613919320882
E-mail addresses:liuxingrong2019@163.com