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 Wine:

"

Most wines are sold in glass bottles and sealed with corks[citation needed] (50% of which come from Portugal).[1] An increasing number of wine producers have been using alternative closures such as screwcaps and synthetic plastic "corks". Although alternative closures are less expensive and reduce the risk of cork taint, they have been blamed for such problems as excessive reduction.[2]