Joan Rivers personal ENT doctor did NOT take a selfie while the comedienne was under anesthesia shortly before she stopped breathing … so claims the doctor herself. Sources closely connected with the doctor say ENT specialist Dr. Gwen Korovin has made it clear … she says the CNN story is absolutely wrong. The network reported a staff member at Yorkville Endoscopy clinic told investigators the doctor took the pic. Several patients of Dr. Korovin have also contacted TMZ to talk about her “unblemished record” and how she is the go-to ENT in NYC.