%0 Journal Article %K epidemiology %K maternal medicine %K public health %B BMJ Open %D 2022 %G eng %M 35193920 %P e055773 %R 10.1136/bmjopen-2021-055773 %T Investigating the optimal handling of uncertain pregnancy episodes in the CPRD GOLD Pregnancy Register: a methodological study using UK primary care data %V 12 %7 2022/02/24 %@ 2044-6055