Oh, dear!
Japanese doctors have diagnosed a medical problem associated with (believe it) too much karaoke-singing. The condition, afflicting the vocal cords, is now called "karaoke polyp."
Moral of the story: Sing karaoke in moderation, gentle reader!
Part of me is wondering now (a) if there are karaoke bars in the EU, and (b) will nanny-state regulation-addicted paper-pushers now try to ban karaoke?
(After all, aside from "karaoke polyp," Japanese doctors have also diagnosed a condition known as "karaokephobia." No, I am not making this up!)
Anyway, do excuse me, won't you? Dissertation? What dissertation? I have a sudden, uncontrollable urge to rush off to the nearest karaoke bar and launch into a rousing rendition of "Girls Just Want to Have Fun."