|Brooklyn Daily Eagle, June 12, 1945
I believe the operation Dash underwent on May 30 was for his ulcers and his death was the result of an infection. Although I'm not positive of that.
Doctors Hospital was located at 170 East End Avenue, between 87th and 88th Streets on the Upper East Side of Manhattan. It was razed in 2005 and today is the site of a condominium building. The hospital's Wikipedia page notes Hardeen as one of its famous patients.