The most well-known hospital in the HHC system is Bellevue Hospital, the oldest public hospital in the United States. Bellevue is the designated hospital for treatment of the President of the United States and other world leaders if they become sick or injured while in New York City. The president of HHC is Ramanathan Raju, MD, a surgeon and former CEO of the Cook County health system in Illinois.

The public hospital that has been around the longest in the US is what?