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The association between parity, infant gender, higher level of paternal education and preterm birth in Pakistan: a cohort study

Kiran Shaikh, Shahirose S Premji*, Marianne S Rose, Ambreen Kazi, Shaneela Khowaja and Suzanne Tough

BMC Pregnancy and Childbirth 2011, 11:88  doi:10.1186/1471-2393-11-88