| Yan Che Contraceptive use before and after marriage in ShanghaiYan Che Shanghai Institute of Planned Parenthood Research, 2140 Xie Tu Road, Shanghai 200032, China Stud Fam Plann 34:44-52. 2003 Periodic abstinence in developing countries: an assessment of failure rates and consequencesYan Che Shanghai Institute of Planned Parenthood Research, 2140 Xie Tu Road, Shanghai 200032, China Contraception 69:15-21. 2004 Unintended pregnancy among newly married couples in ShanghaiYan Che Shanghai Institute of Planned Parenthood Research, Shanghai Int Fam Plan Perspect 30:6-11. 2004 Induced abortion and risk of subsequent miscarriageYuelian Sun Shanghai Institute of Planned Parenthood Research, 2140 Xie Tu Road, Shanghai 200032, China Int J Epidemiol 32:449-54. 2003
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