PubMed:: "Infant, Low Birth Weight"[Mesh] OR small for gestational age[tiab] OR small for date[tiab] OR sga[tiab] OR low birthweight[tiab] OR low birth weight[tiab] OR vlbw[tiab] OR elbw[tiab];; Embase.com:: 'low birth weight'/exp OR 'small for gestational age':ti,ab OR sga:ti,ab OR 'low birthweight':ti,ab OR 'low birth weight':ti,ab OR vlbw:ti,ab OR elbw:ti,ab OR 'small for gestational':ti,ab OR 'small for date':ti,ab