1 University of Pittsburgh School of Medicine, Department of Psychiatry, 3811 O'Hara St., Pittsburgh, PA 15213, United States. Electronic address: chungta@upmc.edu.
2 Max-Planck-Institute for Metabolism Research, Gleueler Str. 50, 50931 Cologne, Germany. Electronic address: marc.tittgemeyer@sf.mpg.de.
3 Oregon Health & Science University, Department of Psychiatry, 3181 SW Sam Jackson Park Rd., M/C DC7P, Portland, OR 97239, United States. Electronic address: feldstei@ohsu.edu.