The present simple, present perfect and past simple are all possible. We don't use the with in hospital in BrE.
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BarbaraPATo add to fivejedjon's response:This is how I interpret the differences: I hear -- this suggests to me that you have heard it from more than one person, at least one quite recently. It is still being talked about. I heard -- this is quite normal. One person (if not more) told you, at some point in the past (that is, more than five minutes ago).I've just heard --