In this study the investigators compare the traditional way of triggering with a new way in patients with Poly Cystic Ovary Syndrome (PCOS). This to reduce the risque of Ovary Hyper Stimulation Syndrome (OHSS) in In Vitro Fertilization/ IntraCytoplastic Sperm Injection (IVF/ ICSI) treatment. The investigators also compare the number of mature oocytes, embryo's and pregnancy rate.
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MII oocytes
Timeframe: patients will be followed during the stimulation with an average of 10 days
2 Pro Nuclei (2PN) fertilization
Timeframe: 24h after ICSI