Qixuan Chen is with the Department of Biostatistics, Hanga Galfalvy is with the Division of Molecular Imaging and Neuropathology, and Naihua Duan is with the Department of Biostatistics and the Division of Biostatistics and Data Coordination, Department of Psychiatry, Columbia University, New York, NY. Hanga Galfalvy and Naihua Duan are also with the New York State Psychiatric Institute, New York.