1 Wayne State University School of Medicine, 540 East Canfield St., Detroit, MI 48201. Electronic address: lcorona@med.wayne.edu.
2 Department of Obstetrics and Gynecology, University of Michigan, 1500 East Medical Center Dr., Ann Arbor, MI 48109. Electronic address: scarolyn@med.umich.edu.
3 Department of Obstetrics and Gynecology, University of Michigan, 1500 East Medical Center Dr., Ann Arbor, MI 48109. Electronic address: morgand@umich.edu.