Figure 2

The flow chart of the progress of participants through the trial.
The subjects of auricular acupressure (AA) group and Sham-AA group were asked to press the acupoints four times a day (08:00, 12:00, 16:00 and 20:00 h respectively) with 15 min each time by themselves. The AA treatment consisted of six days (from 12:00 h of one day before trans-vaginal oocyte retrieval to 20:00 h of the next day of embryo transfer) and was conducted on the two ears simultaneously.