I wear a 9.5 / 10 and these size 9's are very comfortable.  They fit a little roomy in fact, especially after a few days of continuous wearing.  The first day i wore them, it was was bit uncomfortable as i had not been used to the massaging nubs, but by the second day i had no pain in my feet or back.  I would recommend them for all medical professionals, especially since they can be worn with regular work appropriate clothes.