TY - STAND AU - J. Amegadzie AU - O. Badejo AU - J. Gamble AU - M. Wright AU - J. Farrell AU - B. Jackson AU - K. Sultana AU - M. Hashmi AU - Z. Gao BT - BMJ Open DO - 10.1136/bmjopen-2018-024306 M1 - 3 PY - 2019 EP - e024306 T2 - BMJ Open TI - Validated methods to identify patients with asthma-COPD overlap in healthcare databases: a systematic review protocol VL - 9 SN - 2044-6055 ER -