1. Clinical Research Division; Fred Hutchinson Cancer Research Center; Seattle, WA USA
2. Department of Obstetrics & Gynecology; University of Washington; Seattle, WA USA
3. Department of Obstetrics and Gynecology; University of Chicago; Chicago, IL USA
4. Department of Obstetrics and Gynecology; University of Illinois at Chicago; Chicago, IL USA
5. Division of Rheumatology; University of Washington; Seattle, WA USA