TY - STAND AU - R. Joseph AU - T. van Staa AU - M. Lunt AU - M. Abrahamowicz AU - W. Dixon BT - Pharmacoepidemiol Drug Saf DO - 10.1002/pds.4649 M1 - 2 PY - 2019 SP - 179 EP - 186 T2 - Pharmacoepidemiol Drug Saf TI - Exposure measurement error when assessing current glucocorticoid use using UK primary care electronic prescription data VL - 28 SN - 1053-8569 ER -