We found a matchYour institution may have access to this item. Find your institution then sign in to continue.TitleSocial networks and collateral health effects.AuthorsChristakis, Nicholas APublicationBMJ (Clinical research ed.), 2004, Vol 329, Issue 7459, p184ISSN1756-1833Publication typeCommentaryDOI10.1136/bmj.329.7459.184