Table 1.

Search terms used in systematic review

Subject	Search term
Breast neoplasm	Breast neoplasms, subsequent breast neoplasm, breast neoplasm and daughter
Birth weight	Cirth weight, birthweight, birth size
Birth order	Birth order, birth rank
Maternal age	Maternal age, mother's age, parental age
Gestational age	Gestational age, preterm, prematurity, abruption placenta, pre-eclampsia, eclampsia
Twinship	Twin, twining, multiple births, multiple pregnancy, monozygote twin, dizygote twin,
Parental smoking	Maternal smoking, mother's smoking, paternal smoking, father's smoking, parental smoking
Others	Prenatal factors, perinatal factors, intrauterine environment, intrauterine factor, In-utero exposure