1. Department of Surgery, University of Michigan Medical School, Ann Arbor, MI, USA
2. Taubman Health Sciences Library, University of Michigan, Ann Arbor, MI, USA
3. Department of Surgery, Johns Hopkins Medicine, Baltimore, MD, USA
4. Department of Obstetrics and Gynecology, Albert Einstein College of Medicine, New York, NY, USA
5. Department of Surgery, University of Michigan, Ann Arbor, MI, USA