link to the paper: http://aje.oxfordjournals.org/content/early/2011/04/19/aje.kwr027.abstract?sid=f3bdb522-3db9-44aa-8702-5d07ee3abe98 http://aje.oxfordjournals

link to the paper: http://aje.oxfordjournals.org/content/early/2011/04/19/aje.kwr027.abstract?sid=f3bdb522-3db9-44aa-8702-5d07ee3abe98 http://aje.oxfordjournals.org/content/early/2011/04/19/aje.k... I guess that a paper won't get accepted in Am. J. Epidemiol without proper consideration of such correlation. The studies generally try to control for homophilly, contagion and confounding etc.