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Ed Koch is in the hospital and will undergo heart surgery over the next few days. It's nothing too serious: He's scheduled to have an aortic valve replaced and reports that he's in good spirits. The former mayor also says the food at Columbia-Presbyterian is pretty tasty, just in case you have a medical emergency in the near future and you want to factor that bit of info into the decision about which local hospital to go to. [NY1, NYP]