Social network structure and composition in former NFL football players - Dhand, Amar (Northeastern University. Network Science Institute) ; McCafferty, Liam (Brigham and Women's Hospital (Boston, Estats Units d'Amèrica)) ; Grashow, Rachel (Harvard T.H. Chan School of Public Health. Department of Environmental Health) ; Corbin, Ian M. (Brigham and Women's Hospital (Boston, Estats Units d'Amèrica)) ; Cohan, Sarah (Football Players Health Study at Harvard University) ; Whittington, Alicia J. (Football Players Health Study at Harvard University) ; Connor, Ann (Berenson-Allen Center, Beth Israel Deaconess Medical Center. Department of Neurology) ; Baggish, Aaron (Massachusetts General Hospital (Boston)) ; Weisskopf, Mark (Harvard T.H. Chan School of Public Health. Department of Environmental Health) ; Zafonte, Ross (Brigham and Women's Hospital (Boston, Estats Units d'Amèrica)) ; Pascual Leone, Álvaro (Institut Germans Trias i Pujol. Institut Guttmann) ; Barabási, Albert-László (Northeastern University. Department of Physics) ; Universitat Autònoma de Barcelona