Selnes Ola A, Gottesman Rebecca F, Grega Maura A, Baumgartner William A, Zeger Scott L, McKhann Guy M
Department of Neurology, Johns Hopkins University School of Medicine, Baltimore, MD 21205-1910, USA.
N Engl J Med. 2012 Jan 19;366(3):250-7. doi: 10.1056/NEJMra1100109.