Five years at Cook County Hospital transformed Dr. Brad Rosedale into an experienced trauma surgeon who wouldn’t flinch at the sight of the worst carnage. No matter how much blood, how many broken bones, or how bad was the mangled extremity, each body part was a challenge that he could fix and usually restore to proper function. The Uzi machine gun victims, suicide jumpers, and nerve and artery repairs from sword slashes, no longer made him anxious, wondering “how the hell are we going to fix this.” Now, it was just another day or night on the job. Chicago was a glittering city of polar opposites, an incongruous melting pot…