Shah, AD; Nicholas, O; Timmis, AD; Feder, G; Abrams, KR; Chen, RL; Hingorani, AD; (2011) Threshold Haemoglobin Levels and the Prognosis of Stable Coronary Disease: Two New Cohorts and a Systematic Review and Meta-Analysis. PLoS Medicine , 8 (5) , Article e1000439. 10.1371/journal.pmed.1000439. Green open access