Compliance with NPG checklist items: data dictionary available in project space. In version 2, 7 errors from the previous version at database lock (publication date for PMID 25409825 changed from 1/1/2000 to 20/11/2014; publication date for PMID 22622570 changed from 1/1/2000 to 23/05/2014; publication date for PMID 24336168 changed from 1/1/2000 to 15/12/2013; publication date for PMID 25262495 changed from 1/1/2000 to 28/09/2014. PMID 22796663 and 24952910 were categorised as both in vitro and in vivo but are in fact in vitro only; and PMID 22581782 was categorised as both but in fact is in vivo only.