1Department of Internal Medicine, University of Michigan Medical School, Ann Arbor, Michigan, USA. Correspondence: Peter D.R. Higgins, Department of Internal Medicine, University of Michigan Medical School, 3906 Taubman Center, 1150 West Medical Center Drive, SPC 5682, Ann Arbor, Michigan 48109, USA. E-mail: [email protected]
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Waljee et al. (2010) studied this question.