. Author manuscript; available in PMC: 2016 Mar 1.
Published in final edited form as: Psychoneuroendocrinology. 2015 Jan 20;53:256–267. doi: 10.1016/j.psyneuen.2015.01.010
© 2015 Published by Elsevier Ltd.
This manuscript version is made available under the CC BY-NC-ND 4.0 license.