LL 23/10/18 Blue in Sherpa, Author's Pre-print: 	question mark  archiving status unclear
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
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    Publisher automatically deposits in PubMed Central on behalf of authors, Made file available, LL 23/11/18