It is probably caused by abnormality of hormone control of ovarian cycle and various factors in ovary.
其发生可能与卵巢周期各种激素水平调控和卵巢内各种因子调控异常有关。
2
The abnormality of basal hormone level in the patients with unexplained recurrent spontaneous abortion demonstrates premature ovarian aging (POA) might be one of the important etiology.