00576nas a2200193   4500000000100000000000100001008004100002100001300043700001400056700002100070700001600091700001400107700001400121700001400135245020000149300001200349490000700361022001400368       2016                            d1 aE. Berni1 aC. Butler1 aS. Jenkins-Jones1 aH. de Voogd1 aM. Ouwens1 aC. Morgan1 aC. Currie00aComparative estimated effectiveness of antibiotic classes as initial and secondary treatments of respiratory tract infections: longitudinal analysis of routine data from UK primary care 1991-2012  a1023-320 v32  a0300-7995