[1] Ningxia Med Univ, Sch Basic Med Sci, Key Lab Fertil Preservat & Maintenance, Minist Educ, 1160 Shengli St, Yinchuan 750004, Ningxia, Peoples R China
[2] 940th Hosp Joint Logist Support Force Chinese Peo, Ctr Reprod Med, Lanzhou 730050, Gansu, Peoples R China
[3] Tongji Univ, Sch Life Sci & Technol, Shanghai East Hosp, Res Ctr Regenerat Med, Shanghai 200120, Peoples R China