1. Department of Obstetrics and Gynecology, Baylor College of Medicine, Houston, TX, USA,
2. Department of Obstetrics and Gynecology, Oakland University William Beaumont School of Medicine, Rochester, MI, USA,
3. Perinatology Research Branch, NICHD/NIH/DHHS, Detroit, MI, USA,
4. Department of Electrical and Computer Engineering, Oakland University, Rochester, MI, USA,
5. Department of Obstetrics and Gynecology, Wayne State University/Hutzel Hospital, Detroit, MI, USA,
6. Department of Obstetrics and Gynecology, University of Michigan, Ann Arbor, MI, USA, and
7. Department of Epidemiology and Biostatistics, Michigan State University, East Lansing, MI, USA