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. 2010 Jun 8;118(10):1395–1399. doi: 10.1289/ehp.0901764

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Cholinesterase activity of individuals with rs2668207 (A) and rs2048493 (B) genotypes. ls, least-squares mean. The four time periods when cholinesterase levels were collected were 1 May to 8 June 2007 (1); 9 June to 7 July 2007 (2); 8 July to 5 August 2007 (3); and 6 August to 4 September 2007 (4).