Thomas Ebner is an ESHRE-certified senior clinical embryologist and laboratory director at the Department of Gynecological Endocrinology and Kinderwunsch Zentrum, Landes- Frauen- und Kinderklinik Linz, as well as at the Faculty of Medicine, Johannes Kepler University of Linz, Linz, Austria. Pierre Vanderzwalmen is an ESHRE-certified senior clinical embryologist and scientific coordinator at the IVF Centres of Professor Zech in Bregenz, Austria, and at the IVF unit at the Centre Hospitalier Inter-régional Edith Cavell (CHIREC) in Braine l'alleud-Brussels, Belgium. Barbara Wirleitner is an ESHRE-certified clinical embryologist and second scientific coordinator at the IVF Centres of Professor Zech in Bregenz, Austria.

• Part I. Open Vitrification Method; Part II. Closed Vitrification Method.

Thomas Ebner is an ESHRE-certified senior clinical embryologist and laboratory director at the Department of Gynecological Endocrinology and Kinderwunsch Zentrum, Landes- Frauen- und Kinderklinik Linz, as well as at the Faculty of Medicine, Johannes Kepler University of Linz, Linz, Austria. Pierre Vanderzwalmen is an ESHRE-certified senior clinical embryologist and scientific coordinator at the IVF Centres of Professor Zech in Bregenz, Austria, and at the IVF unit at the Centre Hospitalier Inter-régional Edith Cavell (CHIREC) in Braine l'alleud-Brussels, Belgium. Barbara Wirleitner is an ESHRE-certified clinical embryologist and second scientific coordinator at the IVF Centres of Professor Zech in Bregenz, Austria.

• Part I. Open Vitrification Method; Part II. Closed Vitrification Method.

Thomas Ebner is an ESHRE-certified senior clinical embryologist and laboratory director at the Department of Gynecological Endocrinology and Kinderwunsch Zentrum, Landes- Frauen- und Kinderklinik Linz, as well as at the Faculty of Medicine, Johannes Kepler University of Linz, Linz, Austria. Pierre Vanderzwalmen is an ESHRE-certified senior clinical embryologist and scientific coordinator at the IVF Centres of Professor Zech in Bregenz, Austria, and at the IVF unit at the Centre Hospitalier Inter-régional Edith Cavell (CHIREC) in Braine l'alleud-Brussels, Belgium. Barbara Wirleitner is an ESHRE-certified clinical embryologist and second scientific coordinator at the IVF Centres of Professor Zech in Bregenz, Austria.

• Part I. Open Vitrification Method; Part II. Closed Vitrification Method.