Apart from the demographic data, anamnestic details e.g. reason for the infertility, duration of the unfulfilled wish for children, past medical treatment for conception and accompanying illnesses will be documented. The duration of the stimulation with Pergoveris as well as the dose per day will be recorded from the cycle documentations. Follicle sizes and hormones will be documented in accordance with the respectively carried out cycle monitoring. The result of the treatment is related to the number of cycles with ovulation stimulation using hCG, the number of the cycles with puncture, the number of the cycles with embryo transfer, the number and quality of the ova and embryos, on occurred pregnancies and documented abortions. Multiple pregnancies and births will also be recorded.