[1] Univ N Carolina, Dept Psychiat, Chapel Hill, NC 27599 USA
[2] Univ N Carolina, Dept Nutr, Chapel Hill, NC 27599 USA
[3] Karolinska Inst, Dept Med Epidemiol & Biostat, Stockholm, Sweden
[4] Univ Alabama Birmingham, Dept Psychiat & Behav Neurobiol, Birmingham, AL USA