TY - STAND AU - M. Persson AU - K. Harman AU - Y. Vinogradova AU - S. Langan AU - J. Hippisley-Cox AU - K. Thomas AU - S. Gran BT - BMJ Open DO - 10.1136/bmjopen-2019-035934 M1 - 7 PY - 2020 EP - e035934 T2 - BMJ Open TI - Validation study of bullous pemphigoid and pemphigus vulgaris recording in routinely collected electronic primary healthcare records in England VL - 10 SN - 2044-6055 ER -