McGowan Catherine C, Cahn Pedro, Gotuzzo Eduardo, Padgett Denis, Pape Jean W, Wolff Marcelo, Schechter Mauro, Masys Daniel R
Vanderbilt University School of Medicine, Nashville, TN, USA.
Int J Epidemiol. 2007 Oct;36(5):969-76. doi: 10.1093/ije/dym073. Epub 2007 Sep 10.