LL 30/5/17.- Green in Sherpa: Author's Pre-print: green tick author can archive pre-print (ie pre-refereeing) Author's Post-print: green tick author can archive post-print (ie final draft post-refereeing) Publisher's Version/PDF: green tick author can archive publisher's version/PDF General Conditions: Creative Commons Attribution License 4.0 Authors retain copyright Eligible UK authors may deposit in OpenDepot Publisher's version/PDF may be used Published source must be acknowledged with citation Author's pre-prints can be deposited in pre-print servers Publisher will deposit articles in PubMed Central. -- Full-text added, 31.5.17--MMM