Citation Hunt

The Wikipedia snippet below is not backed by a reliable source. Can you find one?

Click I got this! to go to Wikipedia and fix the snippet, or Next! to see another one. Good luck!

In page George W. Santos:

"

George W. Santos was a renowned expert in bone marrow transplantation. He became interested in bone marrow transplantation while serving in the Naval Reserves at the U.S. Naval Radiologic Defense Laboratory in San Francisco from 1956 to 1958. He founded the Johns Hopkins Oncology Center's bone marrow transplant program and served as its director from 1968 until his retirement in 1994. One of his major contributions was the development of the regimen to prepare patients for the procedure by using the anticancer drugs busulfan and cytoxan, which quickly became the worldwide standard.