One of the many unanswered questions swirling around the impending closure of Hahnemann University Hospital in Philadelphia is what will happen to the more than 550 doctors training there. The hospital’s own bankruptcy filings say it’s the largest orphaning of medical residents in U.S. history. WHYY’s Nina Feldman explains why residents at Hahnemann still don’t know where they’re going, and why some of them don’t have long to figure it out.