see also Khalade, Abdul and Jaakkola, Maritta S and Pukkala, Eero and Jaakkola, Jouni JK (2010) Exposure to benzene at work and the risk of leukemia: a systematic review and meta-analysis. Environmental Health, 9 (1). p. 31. ISSN 1476-069X found at http://eprints.bham.ac.uk/509/