TY - STAND AU - A. Hansell AU - J. Hollowell AU - T. Nichols AU - R. McNiece AU - D. Strachan BT - Thorax M1 - 5 PY - 1999 SP - 413 EP - 9 T2 - Thorax TI - Use of the General Practice Research Database (GPRD) for respiratory epidemiology: a comparison with the 4th Morbidity Survey in General Practice (MSGP4) VL - 54 SN - 0040-6376 (Print) 0040-6376 ER -