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 Blue diaper syndrome:

"

It is linked to X linked gene and in order for a person to develop it, both parents must carry the gene.[4] This syndrome is diagnosed through clinical evaluation and a fresh urine sample [4]