I got a missed call on my cellphone. Have no friends in hospital that I know of! They must have a LOT of lines that go out identified as the main # of hospital. I'm assuming someone just dialed a wrong number.
UPDATE: Just got a second call - it's a friend who works there.
I also received a call from them. They hung up as I answered the call. Based on google and online whitepages, it seems to belong to some hospital or medical-related company. Might have been a wrong number in my case.