The authors have declared no competing interest. NCT00018057 Funding from the National Institutes of Health: ZIA-MH002781 (PI: Daniel S. Pine). I confirm all relevant ethical guidelines have been followed, and any necessary IRB and/or ethics committee approvals have been obtained. Yes The details of the IRB/oversight body that provided approval or exemption for the research described are given below: National Institutes of Health (NIH) Institutional Review Board.