**Cryopreservation of Human Spermatozoa by Vitrification** *vs.* **Slow Freezing: Canadian Experience**

S.I. Moskovtsev1,2, A.G-M. Lulat1 and C.L. Librach1,2,3 *1CReATe Fertility Centre 2Department of Obstetrics & Gynaecology, University of Toronto 3Division of Reproductive Endocrinology and Infertility, Department of Obstetrics & Gynaecology, Sunnybrook Health Sciences Centre and Women's College Hospital, Toronto, Ontario Canada* 
