作者单位：Department of Family Practice, University of British Columbia, BC Centre for Disease Control, 655[1]Program for Appropriate Technology in Health, Seattle, United States[2]Department of Obstetrics and Gynecology, University of British Columbia, Vancouver, Canada[3]Department of Obstetrics and Gynecology, Makerere University, Kampala, Uganda[4]Faculty of Health Sciences, Simon Fraser University, Vancouver, Canada[5]
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