00405nas a2200157 4500000000100000000000100001008004100002100001300043700001400056700001400070700001300084245011800097300001100215490000700226022001400233 2013 d1 aC. Tsang1 aA. Bottle1 aA. Majeed1 aP. Aylin00aAdverse events recorded in English primary care: observational study using the General Practice Research Database a534-420 v63 a0960-1643