00474nas a2200181   4500000000100000000000100001008004100002100001400043700001200057700001200069700001300081700001300094700001200107700001300119700002000132700001300152245012700165       2018                            d1 aKennedy S1 aDwyer T1 aHirst J1 aVillar J1 aKnight H1 aOhuma E1 aHennig B1 aPapageorghiou A1 aCheikh I00aSocial gradient of birthweight in England assessed using the INTERGROWTH-21<sup>st</sup> gestational age-specific standard