Moffet Howard H, Adler Nancy, Schillinger Dean, Ahmed Ameena T, Laraia Barbara, Selby Joe V, Neugebauer Romain, Liu Jennifer Y, Parker Melissa M, Warton Margaret, Karter Andrew J
Kaiser Permanente - Division of Research, 2000 Broadway, Oakland, CA 94612, USA.
Int J Epidemiol. 2009 Feb;38(1):38-47. doi: 10.1093/ije/dyn040. Epub 2008 Mar 7.