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 Chest photofluorography:

This text has been unreferenced on Wikipedia for a very long time. If you can't find a source, be bold and remove it!

"

For example, a study in Switzerland[1] between 1988 and 1990, employing abreugraphy to detect tuberculosis in 50,784 immigrants entering the canton of Vaud, discovered 674 foreign people with abnormalities. Of these, 256 had tuberculosis as the primary diagnosis and 34 were smear or culture-positive (5% of all radiological abnormalities).[citation needed]