TY - STAND AU - C. Sammon AU - A. Miller AU - K. Mahtani AU - T. Holt AU - N. McHugh AU - R. Luqmani AU - A. Nightingale BT - Pharmacoepidemiol Drug Saf DO - 10.1002/pds.3750 M1 - 5 PY - 2015 SP - 504 EP - 9 T2 - Pharmacoepidemiol Drug Saf TI - Missing laboratory test data in electronic general practice records: analysis of rheumatoid factor recording in the clinical practice research datalink VL - 24 SN - 1053-8569 ER -