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Anecdotal, but I believe it's very common, nearly ubiquitous, among medical professionals and people who have interacted with preemies.

Yes, it is, at least here in Canada. Source: father of a preemie, had never heard the term before.

In the U.S., as well. I knew the term before my son was born, but honestly, I'm not sure where from.

At hospitals in northeastern USA too.