Final oocyte maturation will be triggered with 0.2 mg triptorelin (Decapeptyl®, Gonapeptyl®) as soon as 3 follicles of ≥17 mm are observed. A GnRH agonist will be the preferred triggering agent for both groups to reduce the risk of severe OHSS associated with human chorionic gonadotropin (hCG) triggering in high-responders. Oocyte retrieval will be performed 36 hours after hCG administration under either local anaesthesia with analgesic premedication or general anaesthesia, according to patient preference.