Received 14 November 2008; received in revised form 15 May 2009; accepted 2 June 2009. published online 25 August 2009.
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aDepartment of Obstetrics, Gynecology, and Reproductive Sciences, Bixby Center for Global Reproductive Health, University of California, San Francisco, San Francisco, CA 94143-0744, USA
bDepartment of Psychology, Arizona State University, Tempe, AZ 85287, USA