Much of the scientific research in the city is done in medicine and the life sciences. New York City has the most post-graduate life sciences degrees awarded annually in the United States, with 127 Nobel laureates having roots in local institutions as of 2004; while in 2012, 43,523 licensed physicians were practicing in New York City. Major biomedical research institutions include Memorial Sloan–Kettering Cancer Center, Rockefeller University, SUNY Downstate Medical Center, Albert Einstein College of Medicine, Mount Sinai School of Medicine, and Weill Cornell Medical College, being joined by the Cornell University/Technion-Israel Institute of Technology venture on Roosevelt Island.
Try to answer this question if possible (otherwise reply "unanswerable"): As of 2012, how many physicians were working in New York City?
43,523