Leiden hospital can't identify sperm donor for 80 children; 9 donors fathered over 400

The administration of the Leiden University Medical Center’s (LUMC) sperm bank, which closed in 2004, is in shambles. The university hospitaln is unable to identify the donor for 80 of the 1,141 children conceived through the sperm bank. It also found nine donors who fathered over 400 children in total - far above the 25 per donor limit. Almost 90 children were conceived with the sperm from one donor.