TY - STAND AU - J. O\textquoterightSullivan AU - S. Stevens AU - J. Oke AU - F. Hobbs AU - C. Salisbury AU - P. Little AU - B. Goldacre AU - C. Bankhead AU - J. Aronson AU - C. Heneghan AU - R. Perera BT - BMC Med DO - 10.1186/s12916-018-1217-1 M1 - 1 PY - 2018 EP - 229 T2 - BMC Med TI - Practice variation in the use of tests in UK primary care: a retrospective analysis of 16 million tests performed over 3.3 million patient years in 2015/16 VL - 16 SN - 1741-7015 ER -