<qa>  What is the detection level of serum estradiol?- According to the detection level of serum estradiol E2, prolactin PRL, progesterone P, testosterone T, luteinizing hormone LH, follicle stimulating hormone FSH, subjects were diagnosed of WHO class II anovulation or oligo-ovulation, and the above hormone level of the subject is normal or normal after treatment at the beginning of study, and FSH10IUL. 