John D. Birkmeyer, University of Michigan (IMAGE) Michigan Medicine - University of Michigan Caption Research by University of Michigan's Dr. John D. Birkmeyer shows wide variation in surgical skill and potential for coaching to reduce surgical complications and shorten operating times. Credit University of Michigan Health System Usage Restrictions None License Licensed content Disclaimer: AAAS and EurekAlert! are not responsible for the accuracy of news releases posted to EurekAlert! by contributing institutions or for the use of any information through the EurekAlert system.