Authors: Ju-Hee Kang; David J Irwin; Alice S Chen-Plotkin; Andrew Siderowf; Chelsea Caspell; Christopher S Coffey; Teresa Waligórska; Peggy Taylor; Sarah Pan; Mark Frasier; Kenneth Marek; Karl Kieburtz; Danna Jennings; Tanya Simuni; Caroline M Tanner; Andrew Singleton; Arthur W Toga; Sohini Chowdhury; Brit Mollenhauer; John Q Trojanowski; Leslie M Shaw Journal: JAMA Neurol Date: 2013-10 Impact factor: 18.302