TY - STAND AU - K. Rothnie AU - H. Mullerova AU - J. Hurst AU - L. Smeeth AU - K. Davis AU - S. Thomas AU - J. Quint BT - PLoS One DO - 10.1371/journal.pone.0151357 M1 - 3 PY - 2016 EP - e0151357 T2 - PLoS One TI - Validation of the Recording of Acute Exacerbations of COPD in UK Primary Care Electronic Healthcare Records VL - 11 SN - 1932-6203 ER -