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 Ashman phenomenon:

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

"

Ashman beats are described as wide complex QRS complexes that follow a short R-R interval preceded by a long R-R interval.[1] This short QRS complex typically has a right bundle branch block morphology and represents an aberrantly conducted complex that originates above the AV node, rather than a complex that originates in either the right or left ventricle.[citation needed]