Green in Sherpa:  author can archive pre-print (ie pre-refereeing).
Author cannot archive post-print (ie final draft post-refereeing),
Author can archive publisher's version/PDF.
•On open access repositories
•Authors retain copyright
•Creative Commons Attribution License
•Published source must be acknowledged
•Publisher's version/PDF must be used for post-print
•Set statement to accompany [This Document is Protected by copyright and was first published by Frontiers. All rights reserved. it is reproduced with permission.]
•Articles are placed in PubMed Central immediately on behalf of authors.
 --27.7.15-MMM