Egocentric Social Network Structure, Health, and Pro-Social Behaviors in a National Panel Study of Americans O'Malley, A. James ; Arbesman, Samuel ; Steiger, Darby Miller ; Fowler, James H. ; Christakis, Nicholas A. Abstract Publication: PLoS ONE Pub Date: May 2012 DOI: 10.1371/journal.pone.0036250 Bibcode: 2012PLoSO...736250O