Cryopreservation of human embryo's and oocytes

1) Aim I) Prospective randomized studies on factors that can increase the efficiency of human embryo cryopreservation: ovarian stimulation, freezing protocols and embryonic quality.II) The establishment of a safe protocol for human oocyte cryopreservation 2) Obiectives A. Investigation of optimal conditions of stimulation and embryo freezing. B. Investigation of optimal conditions of stimulation and freezing for embryos resulting from intracytoplasmic sperm injection or preimplantation diagnosis. C. Improvement of embryonic quality. D. Establishment of a cryopreservation protocol for the human oocyte.